Moustapha's lies darken the whole episode.
I have a suspician: (1) these guys were muscians; (2) they know people were afraid of them; and (3) they decided to have a little "fun" with the Americans by acting REALLY suspicious (e.g., chorigraphed going to the bathroom, leaving McDonald's bag behind in the lavatory); and (4) things spiralled out of control.
JMHO