BREAKING-Hostages being held in Pittsburgh highrise
A gunman is believed to be holding people hostage in a downtown Pittsburgh high rise, police said.
Officers are responding to the situation on the 16th floor of Gateway Center building number three, said Pittsburgh police spokeswoman Diane Richard.
Police received calls shortly after 8:15 a.m., reporting a man with a gun was on that floor.
More to come when it becomes available.