They know people were shot in the parking lot; one live witness has stated that. He was in his car and looked right at the shooter. Windshield saved his life.
I just watched a news story from a local TV station and it seems like the shooter was OUTSIDE, on the north side of the planned parenthood building most or maybe even all of the time. Everyone who was shot was outside, many were pinned in place. The way the news makes it seems like it was an attack oN planned parenthood.
There is a partial transcript of some salient statements in the police transmissions here, far from complete, but what I could grab while listening and typing, too.
Also, one of the more interesting comments from the audio feed page posted in that post, too.
Indications from that are that most of the shooting (if not all) was conducted outside the building.