A gas explosion leveled two buildings in New York’s East Village this past week, with two neighboring structures damaged, one still at risk for collapse, and 22 people injured, four of them severely. The fire raged from early afternoon into the next morning with more than 250 firefighters responding. Just over a year ago, a gas explosion leveled two buildings in Harlem, killing eight people. The National Transportation Safety Board has not yet released its conclusions as to what caused the Harlem fire.