Miami police have not confirmed the details of what happened next, but sources close to the investigation told CBS4 News that officers found one man gnawing on the face of another, in what one police source called the most gruesome thing he’d ever seen.

The fight was taking place at the causeway exit near the Miami Herald building, and amazed officers tried to stop it, ordering the man making a meal out of the other man to stop.

Sources told CBS4 that the man refused to obey, and continued his attack. Investigators sharing limited details about the confrontation, saying only that the two men were fighting and the officers felt they had no choice but to take deadly force.