I'm thinking an ex-cop or a cop wannabee. He knows the local area and local PDs, and was able to flee today and avoid a huge dragnet. When they finally catch him/them, I think they'll discover a scanner with all of the local/state frequencies programmed in.
I'm thinking at least 2. 1 ex cop AND 1 ex military. One knows police procedures and can think like a cop. The other, weapons, stealth and tactical strategy.
May even be a third involved.