Description:RAW VIDEO: The gunman behind a shooting that erupted Wednesday morning at an office building in Phoenix is believed to be an elderly man, police said.
Phoenix police initially said there were at least five people shot but have now confirmed that three people were injured.
One person was taken to a hospital in extremely critical condition. Two others were hospitalized for injuries that are not life-threatening, said Sgt. Tommy Thompson of the Phoenix Police Department.(0:43)