Here is an interesting compilation of police radio traffic from the May 31 shooting at the Virginia Beach public works department which killed 12.
It sounds like the law enforcement response was well coordinated with multiple officers responding and making an entry to the complex.
Another interesting note was it seemed like the description of the attacker's weapon was identified correctly as a hand gun with an attached suppressor. This might be the first time I've ever heard of a suppressor being used in a shooting like this. It's commendable the on-scene officer knew what he was looking at.
The police response has been reported as two minutes after emergency calls for shots fired at Virginia Beach's municipal building No. 2 at 4:08 p.m.
Virginia Beach Police Chief Jim Cervera described the three-story municipal building with a basement as a "honeycomb," a maze of doors, stairwells and offices used by city municipal workers.