500 attended unauthorized concert at Montrose Beach that ended in brawl
Cook County prosecutors now say 500 people attended the concert that turned into a brawl at Montrose Beach.
Fights broke out after the crowd gathered for an unauthorized beach party concert on Sunday afternoon.
Police say officers were looking for a man with a gun when members of the crowd started throwing rocks and bottles.
Four officers suffered minor injuries.
Five are charged in connection with the melee.