The police chief at the press conference said at least 2 doors were chained. The Palestinian kid, Jamal, who took the cell phone footage said he noticed policemen having a hard time getting into the main entrance to the building.
Somebody earlier in the afternoon proposed that the “perp” was in the building for some time before the shootings started...he would have had to be if he was the one who chained the doors.
Also, the chief said the shootings were in different parts of the Norris building, so he was definitely killing in more than one classsroom.
I’ve thought that if the two incidents are tied together, either the first was diversionary (which would also be in keeping with the Chicago Suntimes story about the bomb scares being to “test” security)
or
the first killing, if it was a girlfriend, was the random act and she was killed because she found out what he intended to do and the planned event was the Norris building...the RA was killed because he was in the wrong place at the wrong time.
Some of the earliest footage was a shot of a SWAT guy running along carrying a bolt cutter.