Officials in Texas gave an update on what happened Tuesday when a gunman opened fire at Robb Elementary School, leaving 19 small children and two adults dead.
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Victor Escalon, the South Texas Regional Director of the Department of Public Safety, said the investigation continues into what exactly happened. He explained the timeline, as it stands now, of what happened and when it happened.
Read More Escalon confirmed that the gunman entered the school through an unlocked door at the school.
Escalon said that at 11:28 a.m. local time, police received the first report of a truck that had crashed. The gunman had driven off after police said he shot his grandmother, who is now listed in stable condition.
>>Read: Uvalde shooter’s grandmother is continuing to recover at a Texas hospital
The shooter then jumped out of the passenger side of the truck, with a rifle and a bag that was later to be found with ammunition. The shooter saw two people at a nearby funeral home and Escalon said the gunman fired shots toward them before jumping a fence at the school, went across a parking lot and then at 11:40 a.m., walked into the elementary school through an unlocked door.
Escalon said a video was obtained from inside and outside of the school that showed multiple rounds being fired inside the school. Officials do not have an exact number.
>>Read: Texas elementary school shooting: What we know now
Four minutes after the shooter went into the school, the police arrived, made entry into the building, and after hearing gunfire, retreated and took cover.
Escalon clarified an earlier statement made by the Department of Public Safety, saying that the gunman was not confronted by anyone, despite previous reports that a school safety officer had “encountered” the gunman. He said there was no officer readily available on the campus when the gunman first arrived at the school.
>>Read: Texas school shooting: Bystanders shouted at police to enter Robb Elementary
The gunman walked into a classroom after going down a couple of hallways.
While the gunman was in the classroom, officers were asking for help and were trying to get equipment and tactical teams to the scene.
While they were waiting for teams to arrive and making a plan to enter the building, officials were also negotiating with the gunman, Escalon said.
About an hour later, a tactical team from U.S. Customs and Border Patrol arrived. They shot and killed the gunman. A Uvalde police officer and a sheriff’s deputy were also there.
After the gunman was down, officers went into rescue operations to get students and teachers out of the building.
Escalon said the officers who were at the scene are being interviewed and the investigation continues. He will provide additional updates when more information becomes available.
After the update, Ross McGlothlin, a former principal of Robb Elementary School told CNN that the door would typically have been locked. He said there were school resource officers in the district when he worked for the district, but they weren’t assigned.
He said there was a system that would alert teachers in case of an emergency that would direct them to go into a lockdown.
Photos: Meghan Markle, Uvalde residents pay tribute to Texas shooting victims Meghan Markle, Duchess of Sussex, leaves flowers at a memorial site, Thursday, May 26, 2022, for the victims killed in this week's elementary school shooting in Uvalde, Texas. (AP Photo/Jae C. Hong)
Meghan Markle, Uvalde residents pay tribute to Texas shooting victims Meghan Markle, Duchess of Sussex, visits a memorial site with flowers, Thursday, May 26, 2022, to honor the victims killed in this week's elementary school shooting in Uvalde, Texas. (AP Photo/Jae C. Hong)
Meghan Markle, Uvalde residents pay tribute to Texas shooting victims Meghan Markle, Duchess of Sussex, visits a memorial site, Thursday, May 26, 2022, honoring the victims killed in Tuesday's elementary school shooting in Uvalde, Texas. (Jae C. Hong/AP)
Photos: Texas school shooting victims remembered at Uvalde memorial site Children pay their respects at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site A woman reacts as she pays her respects at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site Crosses with the names of Tuesday's shooting victims are placed outside Robb Elementary School in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde memorial site A child writes a message on a cross at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site Children pray and pay their respects at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site Prianna Ayala weeps as she is embraced at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site Mario Games, right, and his wife, Marisela and daughter Emily, react as they stand in front of a cross with the name of their niece, Nevaeh Bravo, at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site Mario Games, right, and his wife, Marisela and daughter Emily, react as they stand in front of a cross with the name of their niece, Nevaeh Bravo, at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site A child writes a message on a cross at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site A child leaves flowers at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site A girl writing a message on a cross is reflected in the water at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde memorial site People pay their respects at a memorial site for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde memorial site People gather at a memorial site to pay their respects for the victims killed in this week's elementary school shooting in Uvalde, Texas, Thursday, May 26, 2022. (AP Photo/Jae C. Hong)
Texas School Shooting The Archbishop of San Antonio, Gustavo Garcia-Siller, comforts families outside of the Civic Center following a deadly school shooting at Robb Elementary School in Uvalde, Texas Tuesday, May 24, 2022. (AP Photo/Dario Lopez-Mills)
Texas elementary school shooting: What we know about the victims Members of the community gather at the city of Uvalde Town Square for a prayer vigil in the wake of a mass shooting at Robb Elementary School on May 24, 2022, in Uvalde, Texas. (Jordan Vonderhaar/Getty Images)
Photos: Texas elementary school shooting leaves 19 children, 2 adults dead People react outside the Civic Center following a deadly school shooting at Robb Elementary School in Uvalde, Texas Tuesday, May 24, 2022. (AP Photo/Dario Lopez-Mills)
Texas School Shooting The Archbishop of San Antonio, Gustavo Garcia-Siller, right, comforts families outside of the Civic Center following a deadly school shooting at Robb Elementary School, in Uvalde, Texas Tuesday, May 24, 2022. (AP Photo/Dario Lopez-Mills)
Photos: Texas elementary school shooting leaves 19 children, 2 adults dead The American flag flies at half staff on the White House after President Joe Biden spoke about the mass shooting at Robb Elementary School in Uvalde, Texas, from the White House, in Washington, Tuesday, May 24, 2022. (AP Photo/Manuel Balce Ceneta)
Photos: Texas elementary school shooting leaves 19 children, 2 adults dead President Joe Biden speaks to the nation about the mass shooting at Robb Elementary School in Uvalde, Texas, from the White House, in Washington, Tuesday, May 24, 2022, as first lady Jill Biden listens. (AP Photo/Manuel Balce Ceneta)
Photos: Texas elementary school shooting leaves 19 children, 2 adults dead President Joe Biden tells reporters he will speak about the mass shooting at Robb Elementary School in Uvalde, Texas, later in the evening as he arrives at the White House, in Washington, from his trip to Asia, Tuesday, May 24, 2022. (AP Photo/Manuel Balce Ceneta)
Photos: Texas elementary school shooting leaves 19 children, 2 adults dead People react outside the Civic Center in Uvalde, Texas, Tuesday, May 24, 2022. An 18-year-old gunman opened fire at a Texas elementary school, killing multiple people. (AP Photo/Dario Lopez-Mills)
Photos: Texas elementary school shooting leaves 19 children, 2 adults dead People wait outside of the Civic Center in Uvalde, Texas, Tuesday, May 24, 2022. An 18-year-old gunman opened fire at Robb Elementary School, killing multiple people. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Law enforcement personnel stand next to an armored vehicle outside Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Law enforcement personnel gather gear outside Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Law enforcement personnel, including the FBI, gather near Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Law enforcement personnel, including the FBI, arrive at Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Law enforcement personnel stand outside Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Law enforcement personnel stand outside Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Law enforcement personnel stand outside Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting A Texas State Police officer walks outside Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Law enforcement, and other first responders, gather outside Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Police walk near Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Police walk near Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Images from the Robb Elementary shooting Police walk near Robb Elementary School following a shooting, Tuesday, May 24, 2022, in Uvalde, Texas. (AP Photo/Dario Lopez-Mills)
Photos: Texas school shooting victims remembered at Uvalde vigil Esmeralda Bravo, 63, sheds tears while holding a photo of her granddaughter, Nevaeh, one of the Robb Elementary School shooting victims, during a prayer vigil in Uvalde, Texas, Wednesday, May 25, 2022. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde vigil Two family members of one of the victims killed in Tuesday's shooting at Robb Elementary School comfort each other during a prayer vigil in Uvalde, Texas, Wednesday, May 25, 2022. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde vigil Family members of one of the victims killed in Tuesday's shooting at Robb Elementary School embrace each other after a prayer vigil in Uvalde, Texas, Wednesday, May 25, 2022. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde vigil Stormy Flores, 11, sits with a sign bearing the names of the Robb Elementary School shooting victims during a prayer vigil in Uvalde, Texas, Wednesday, May 25, 2022. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde vigil Sen. Ted Cruz, R-Texas, far right, prays with a man during a prayer vigil in Uvalde, Texas, Wednesday, May 25, 2022. The vigil was held to honor the victims killed in Tuesday's shooting at Robb Elementary School. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde vigil A young girl listen to a message during a prayer vigil for the Robb Elementary School shooting victims in Uvalde, Texas, Wednesday, May 25, 2022. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde vigil Sen. Ted Cruz, R-Texas, right, and Uvalde County Sheriff Ruben Nolasco pray during a prayer vigil in Uvalde, Texas, Wednesday, May 25, 2022. The vigil was held to honor the victims killed in Tuesday's shooting at Robb Elementary School. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde vigil Esmeralda Bravo, center, holds a photo of her granddaughter, Nevaeh, one of the Robb Elementary School shooting victims, as she is comforted by Nevaeh's cousin, Anayeli, during a prayer vigil in Uvalde, Texas, Wednesday, May 25, 2022. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde vigil Family members and relatives of Nevaeh Bravo, one of the Robb Elementary School shooting victims, attend a prayer vigil in Uvalde, Texas, Wednesday, May 25, 2022. (AP Photo/Jae C. Hong)
Photos: Texas school shooting victims remembered at Uvalde vigil People listen to a message during a prayer vigil for the Robb Elementary School shooting victims in Uvalde, Texas, Wednesday, May 25, 2022. (AP Photo/Jae C. Hong)