[livius]

"A "Bat Cave" in any metro area could easily be those Rental Storage garages ..."

Excellent point! They are frequently located around shopping malls and highways, too. Certainly having a scattering of large storage units to go to ground in could explain how they disappear so fast.

Hope somebody's checking large storage units near these scenes.

[BiffSchneider]

"Hope somebody's checking large storage units near these scenes"

Unless the manager and all the workers of the storage place are in on this with the sniper, I'd imagine that those storage places have already been checked by said managers and employees. There is a rather large reward available.

This could be a storage place, but they'd have to be very careful that no one else saw them and have a place to hide the truck and/or van where none of the customers could see it. Perhaps a manager could do that. He could even fake the surveillance tape to cover up his entry/exit from the storage place. Or, it could be a bankrupt/deserted storage facility or the like.

[Gritty]

"A "Bat Cave" in any metro area could easily be those Rental Storage garages ..."

A "Bat Cave" need not necessarily be a storage unit or a Mosque.

It could be an empty 40' container on an 18 wheeler parked nearby but out of sight. Just drive right in, close up, and then drive the big truck away.

Gone, and the cops can search all day.

This is a "Bat Cave" that could be mobile and used anyplace. The requirements are a good hiding (parking) place nearby and proper recon and practice of escape routes to the big truck.