5 police officers shot, 3 dead in Pennsylvania, FBI investigating

Five police officers were shot and three were killed in a shooting in York County, Pennsylvania, on Wednesday, authorities said.

The gunman, who has not yet been publicly identified, was killed by police, according to Pennsylvania State Police Commissioner Col. Christopher Paris. 

He added authorities know "who they are and who they work for," but did not comment on the motive.

The shooting took place as officers were following up on a "domestic-related" investigation that started Tuesday, Paris said.