The footage shows that multiple officers were inside the building with rifles and at least one ballistic shield, nine minutes after the gunman arrived. They didn’t enter the classroom the shooter was inside for another 58 minutes.

Investigators believe this will prove to be a significant development as it indicates they had more than enough firepower and protection to enter that classroom before they actually did.

Authorities have since developed their most extensive timeline yet since the shooting, in which an 18-year-old armed with AR-15 walked into the school, killing 19 students and two teachers. Much of this new information is expected to be presented at a Texas Senate hearing on Tuesday, the first of two consecutive days at the Capitol where members of the public can address lawmakers…

Based on the newest information, it is believed that 11 officers entered the school within three minutes of the gunman. District Police Chief Pete Arredondo reportedly called a landline at the Uvalde Police Department at 11:40 a.m. for help.