An investigation found that Scot Peterson, a former sheriff’s deputy who was serving as the school resource officer at Marjory Stoneman Douglas High School, did “absolutely nothing to mitigate” the mass shooting at the school on Feb. 14, 2018, according to the Florida Department of Law Enforcement.

[Read the latest story: Scot Peterson appears in court today]

The gunman in the massacre killed 17 students, teachers and staff, and wounded 17 others. Mr. Peterson, who was the only armed guard on campus, was charged on Tuesday with seven counts of felony neglect of a child for not doing more to protect students. He was also charged with culpable negligence and perjury.

Here’s what officials said Mr. Peterson failed to do:

He didn’t go into the building during the shooting or investigate the source of the gunfire.

Mr. Peterson had been trained that officers responding to an active shooter must “immediately go to confront the shooter” and “move directly and quickly toward known threat.”