Uvalde police were in the school for more than an hour before confronting the gunman

An 18-year-old gunman named Savador Ramos entered an elementary school in Uvalde on Tuesday and killed 19 fourth graders and two teachers. At least 17 people were injured.

According to a timeline from Steven McCraw, head of the Texas Department of Public Safety, one hour and 20 minutes elapsed between the first call to 911 and police finally confronting the shooter, who had fired at least 142 rounds in the school. What happened in between at Robb Elementary School has ignited public outrage over whether police could have saved lives by acting more quickly.

The following is a timeline outlined by McCraw at a press conference on Friday. The portion of the timeline in bold represents the time when law enforcement stood outside the classroom.

11:30: Teacher calls 911 and reports a car crash and a man with a gun.

11:31: An officer arrives at the school and drives past Ramos, who is hiding between cars in the parking lot, around to the back of the school.

11:32: Ramos begins shooting into classrooms from outside the school.

11:33: Ramos enters the school and begins shooting into room 111 or 112. He shoots more than 100 rounds.

11:35: Three Uvalde Police Department officers enter the school through the door Ramos used, followed by four more.

The three officers who first arrived go to the door of the classroom. The door is closed, and two receive grazing wounds from the shooter.

11:37: Ramos fires 16 more rounds.

11:51: Police sergeant and sheriff’s department agents start to arrive.

12:03: Officers continue to arrive in the hallway; 19 officers are in the hallway by this time.

12:03: First 911 call from inside the classroom from a girl who whispers that she’s in room 112.

12:10: Second 911 call: She calls back and says multiple people are dead.

12:13: Third 911 call: The same girl calls again.

12:15: Border Patrol Tactical Unit arrives with shields.

12:16: Fourth 911 call: The same girl calls and says eight or nine students are still alive.

12:19: Fifth 911 call: A different girl in classroom 111 calls. She ends the call when another student tells her to hang up.

12:21: Ramos fires again; he’s believed to be at the door. Police found 142 rounds of spent cartridges after the shooting ended.

12:36: Sixth 911 call: The initial caller in classroom 112 calls and is told to stay on the line and be very quiet. She says: “He shot the door.”

12:43: She asks 911 to “please send the police now.”

12:46: She says she can hear the police outside the door.

12:50: Law enforcement opens the doors with keys they got from a janitor. They kill Ramos.

12:51: Children leave the classrooms.