I found this online while looking for info on the shooting, thought it was interesting that all he had when he entered the building was Joe Biden's favorite CCW, a shotgun. Then proceeded to take weapons from the security and police.
3:15 p.m. According to NBC Washington, video footage shows one gunman entering the building with a shotgun. He reportedly shot a security guard and then proceeded on through the building, possibly with the security guard’s pistol. He may have hidden in wait for responding police officers, then opened fire, shooting one D.C. officer in the leg and then may have retrieved that officer’s AR-15 rifle.
I don't think they will let this info get out, it might disrupt the endless flow of ignorant Kali dumocrat voters that keep putting this has-been bimbo in the senate.