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Details on the mass shooting at a Texas elementary continued to emerge yesterday, with officials saying all 21 victims—19 children and two adults—were all part of the same classroom in which the gunman had barricaded himself. At least 17 more people were injured from the attack, officials said. See the list of victims known so far here.

The 18-year-old suspect reportedly warned about his plans in the hour leading up to the attack, later posting he had killed his grandmother and was heading to the elementary. The shooter, a student at the town’s high school, used an AR-15 style semiautomatic rifle, which was one of two rifles he legally bought shortly after his birthday and just days before the attack. A motive still hasn’t been determined.

A team of federal and local law enforcement officers killed the suspect. Other officers on the scene were unable to do so after the shooter barricaded himself; they turned to breaking windows to help other teachers and students escape.

The killings have reignited debates over gun control legislation, though Majority Leader Chuck Schumer (D-NY) said yesterday he would not immediately bring a bill to the floor for a vote. A prayer vigil for the victims was held last night.

See a list of the deadliest US school shootings since Columbine here.