Fist fights at Carson Beach in Boston; Louder and rowdier than veteran cops recall

boston.com Massive law enforcement response to unruly gangs -- police confronted by 1,000 people ... wlsam.com While City of Chicago says North Avenue Beach was closed down because of heat illlness risk; witnesses saw "large gangbanger element" ... suntimes.com Acting Police Supt. Garry McCarthy says gangs, flash mob, violence had nothing to do with decision to close beach ...