My guess is they holed up for a couple days. Then made a break for it. Needed cash so hit the 7-11. Then went to MIT to plant the load of IED’s. Got caught. And then they were on the run with the IED’s they had not planted. They probably were gonna drop their load of IED’s at MIT and then hit the road to their next cell nexus.
Rocket scientists they ain't - if you're gonna do something like this, ya gotta have escape planned and PLENTY of cash beforehand ...