Police in Pittsburgh mistook a blood-splattered movie set for a real life murder scene -- for eight hours.

One officer labeled the room "the most grisly murder scene" he'd witnessed in 35 years in law enforcement.

Firefighters responding to a call at the George Washington hotel happened upon the room. They saw blood splattered everywhere, bottles of alcohol scattered about the room and "a piece of a scalp with hair still attached."

Eight hours into their investigation, police realized the "blood" wasn't real and they were dealing with a set left over from a film shoot. According to the hotel's owner, it had been left untouched in case the filmmakers needed to come back for re-shoots.

"You are kidding me," said Helen Mirren from Death Row.