'The argument, which, according to multiple reports, took place inside the Recess nightclub in the Old City, started over ownership of a bottle of champagne, according to the police statement. Police said that "pushing and shoving" over the bottle led to one of the off-duty officers being knocked to the ground, and while he was on the ground, he was "punched, kicked and stomped about his body and head multiple times by all four suspects."'