Surveillance video shows people running out of a Chick-fil-A after police said an off-duty officer shot and killed a man chasing two people with a knife.

Boston Mayor Michelle Wu is coming under blistering condemnation for sending condolences to an knife-wielding attacker shot and killed by an off-duty police officer who is credited with saving

Two people were chased inside Chick-fil-A on Boylston Street around 5:27 p.m. by a man armed with a knife, officials said.