[Armorer-at-Law]

Brown and Brinkworth also revealed new details about the incident, which started with an anonymous call to the school and culminated with an extensive search by the SWAT team.

The school received the call about 4:15 p.m. notifying staff that someone had entered the school with a gun. Brown and Brinkworth said it is not yet clear who placed the call. Around that time, 911 received two calls about the incident, prompting the school to go into lockdown and touching off a search of the building by police and SWAT team responders.

This is quite curious. If someone saw the gun on him, was concerned and made the call, it would seem they would be willing to step forward.