On February 14, 1929, two men posing as police officers and two men dressed in trenchcoats entered the S.M.C Cartage Co. garage owned by George "Bugs" Moran, lined up seven men against the wall and opened fire from submachine guns, shotguns and a revolver, killing various members of Moran's North Side Irish gang.  All seven men were killed in a volley of seventy machine-gun bullets and two shotgun blasts, according to the coroner's report.  Al Capone's South Side Italian gang was largely believed to have been behind the attack, but officials could not prove Capone's involvement, as he was in Miami on the day of the murders.  No one was tried, let alone convicted, in connection with the killings.  Encyclopedia of Chicago writer Christopher P. Thale effectively summarizes the massacre, which "left the public in shock and...came to symbolize gang violence. It confirmed popular images associating Chicago with mobsters, crime, and spectacular carnage."  The warehouse was razed in 1967.