According to the officials, agents from BORTAC, the Customs and Border Protection tactical unit, and ICE's Homeland Security Investigations (HSI) arrived on the scene between noon and 12:15 p.m. on Tuesday. Local law enforcement asked them to wait, and then instructed HSI agents to help pull children out of the windows.
The BORTAC team, armed with tactical gear, at first did not move toward the gunman. After approximately 30 minutes passed, however, the federal agents opted of their own volition to lead the “stack” of officers inside the school and take down the shooter.