What a butthead! A massive, fiery car explosion that injured seven firefighters on a Bronx street Wednesday night was caused by someone’s flippantly flicked cigarette butt, officials said. Smoke-eaters were responding to a garbage fire in front of a building between Intervale Avenue and Kelly Street in Longwood around 7:06 p.

Seven firefighters were hospitalized Wednesday night after a garbage fire spread to several parked cars and triggered a powerful explosion in the Bronx, officials said.