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Texas officials released an updated timeline of Tuesday’s mass shooting at an elementary school outside San Antonio, saying the gunman was inside the school for more than an hour. The updates come amid scrutiny of the police response during the standoff in which 19 children and two adults were killed. 

Officials said the attacker arrived at the scene around 11:30 am local time, crashing his vehicle into a ditch. Contrary to previous reports, he did not encounter an armed school security officer and entered the school unobstructed after 12 minutes outside the facility.

The first responding officers exchanged gunfire, but did not pursue the suspect into the building. The standoff reportedly ended around 12:45 pm after a tactical Border Patrol unit arrived on the scene and stormed the classroom in which the shooter had barricaded himself. 

Videos posted to social media show police preventing frantic parents from entering the building, though it is unclear at what point the gunman opened fire inside the classroom.

The gunman’s motive remains under investigation. See our previous write-ups on the attack here and here.

Separately, a bill establishing domestic terrorism-focused offices within federal law enforcement agencies failed in the Senate, by a vote of 47-47. Critics argued such activity was already covered under existing provisions.