The shootings in Pittsburgh happened in a neighborhood called Stanton Heights. It's a few miles from the Pittsburgh Zoo. I grew up walking distance from this neighborhood and spent a lot of time on those streets when I was young. I was on my way to my parent's house the morning of these shootings so I drove by and there were police cars parked as far as 2 city blocks away, S.W.A.T teams, canines, paramedics, a helicopter...you name it!
An officer told me later the next day, unconfirmed, that the first 2 cops were responding to a domestic at about 7:00 am and they were shot as soon as they entered the house. The third officer, who was coming home from the night shift, stopped to assist and was attempting to pull one or both of the shot officers out of the house when he was shot and killed also. No one could get to the shot officers to help them til about 10:00 when the shooter surrendered....carrying 3 guns and wearing his body armor.
The news reported 50 to 60 bullets being shot in 3 seperate 10 to 15 minute intervals. The shooter said he was mad at the police because a few years ago an officer stopped him and took his marijuana!