Bahadir Koseli, a customer at one of the franchise's locations in Dallas, shot some now-viral footage of mice scattered about on the floor and on the wall of a Chipotle restaurant. Other patrons of that Chipotle that were interviewed by NBC DFW claimed that the rodents fell out of the ceiling. Some customers kept eating as the rats crawled on by while others understandably freaked out and left the restaurant.
Chipotle did issue a statement about the fracas later on, claiming that professionals identified a "structural gap" in the restaurant as a potential access point for the mice to have crept in. The gap was immediately sealed upon discovery. Chipotle also emphasized how unlikely this event was to occur, claiming that "this is an extremely isolated and rare incident and certainly not anything we’d ever want our customers to encounter."
I kind of feel bad for Chipotle at this point, to be honest. Suffering a norovirus outbreak and having rats tumble into one of your restaurants in the same week? That's just a ton of really bad luck.