Shots were fired at the Pentagon in Arlington, Virginia October 19, authorities said, striking a window of the building. A Pentagon police spokesman said it is not known who fired the shots. Pentagon police officers heard at least five shots around 4:50 a.m. According to another Pentagon Force Protection Agency spokesman, two bullets hit the Pentagon on the south side of the building — one striking a window and the other hitting the building itself. This is an unoccupied part of the building that is being renovated. The spokesman said a fragment of one of the bullets is lodged in the window. The windows, which are bullet-proof, did not shatter. There was a partial lockdown of the Pentagon’s south parking lot and south entrance for about 1 hour after the shooting, and authorities briefly shut down a portion of Interstate 395 going out of the capital — which runs along the south side of the Pentagon — to conduct a search in the investigation.