Shocking new footage shows the terrorists in Saturday’s London attack just moments before cops shot them dead.

The video, captured on a cellphone, shows the three knife-wielding men sauntering past bars at Borough Market as terrified citizens hide inside — apparently after the cold-blooded killers had just carried their carnage, the Express reported.

“I’ve never seen anything like it. It was like a scene from a Western. They were walking around like outlaws heading for a showdown at the OK Corral,” one witness told the paper.

One of the men appears to be dressed in a soccer jersey and camouflage pants, another is in a black hoodie, and a third in a striped shirt.

The attackers first drove over London Bridge, plowing into pedestrians, before they got out at the market and went on a stabbing spree, killing at least seven and sending 48 to the hospital.