Schwinnrider, this is what immediately came to mind but, I guess this never happened....

Officer Fatally Shot Outside Police Station
Slaying Is 1st in Line of Duty in Fairfax; Gunman, 18, Is Killed After Opening Fire

By Tom Jackman and Lisa Rein
Washington Post Staff Writers
Tuesday, May 9, 2006; Page A01

A Fairfax County police detective was killed and two officers were wounded yesterday afternoon after a gunman opened fire with high-powered weapons in the parking lot of a police station during a shift change, law enforcement officials said.

http://www.washingtonpost.com/wp-dyn...050800968.html