SPRINGFIELD (Reuters) - An explosion triggered by a gas leak destroyed a strip club in downtown Springfield, Massachusetts, late on Friday, injuring 18 people, although none seriously, authorities said. Springfield Mayor Domenic Sarno said the building, a Scores Gentlemen’s Club, exploded at about 5:25 pm as gas company workers, police officers and firefighters were responding to a leak in the area. The 18 injured people included nine firefighters, four Columbia Gas of Massachusetts employees and two police officers, Sarno said.