If they don't want to make the trip, I hear the LAPD has a good track record too, and they're a little closer.The changing timelines highlight how unprepared the LVPD was and is forr something like this.
They might be great guys but they are completely out of their league on this.
They should man up and ask for help. Not Fed help; the FBI is as crooked as sin. Help from a credible, large municipal police force with a track record of successful strategic and tactical anti-terrorist actions.