Police regained control of downtown Montreal early Thursday after firing tear gas at hundreds of bottle-tossing youths. Groups looted businesses after the Canadiens defeated the Penguins in Game 7 of their semifinal series. Police said 41 people were arrested. Two officers sustained minor injuries. Montreal has a history of hockey-related violence. Cars were burned and downtown stores were trashed and looted after the Canadiens beat Boston in the 2008 playoffs, and there also were riots after Montreal's Stanley Cup victories in 1986 and 1993.