UVALDE, Texas (AP) — The Uvalde school district fired police chief Pete Arredondo on Wednesday under mounting pressure in the grieving Texas town to punish officers over letting a gunman at Robb Elementary School remain in a fourth-grade classroom for more than an hour with an AR-15 style rifle as 19 children and two teachers were killed.

In a unanimous vote, the Uvalde Consolidated Independent School District’s board of trustees fired Arredondo in an auditorium of parents and survivors of the May 24 massacre. Arredondo, who did not attend the meeting, becomes the first officer to lose his job following one of the deadliest classroom shootings in US history.

His ouster came three months to the day after the tragedy, and less than two weeks before students return to school in Uvalde, where some children remain too scared or scarred to go back inside a classroom.

Arredondo, who has been on leave from the district since June 22, has come under the most intense scrutiny of the nearly 400 officers who rushed to school but waited more than 70 minutes to confront the 18-year-old gunman in a fourth-grade classroom.

Most notably, Arredondo was criticised for not ordering officers to act sooner. Colonel Steve McCraw, director of the Texas Department of Public Safety, has said Arredondo was in charge of the law enforcement response to the attack.

Uvalde school officials have been under mounting pressure from victims’ families and members of the community, many of whom have called for Arredondo’s termination. Superintendent Hal Harrell had first moved to fire Arredondo in July but postponed the decision at the request of the police chief’s attorney.

School officials have said the campus at Robb Elementary will no longer be used when students return September 6. Instead, campuses elsewhere in Uvalde will serve as temporary classrooms for elementary school students, not all of whom are willing to return to school in-person following the shooting.

School officials say a virtual academy will be offered for students. The district has not said how many students will attend virtually, but a new state law passed last year in Texas following the pandemic limits the number of eligible students receiving remote instruction to “10 percent of all enrolled students within a given school system.”