A Hillsborough Township man suffered second degree burns to his arm in an explosion caused by homemade fireworks early Saturday morning, local police say. First responders from Hillsborough and neighboring towns, as well as a State Police bomb squad, rushed to the Three Bridges Roadhome just before 4 a.m. “Upon police arrival, it was determined that the male mixed chemicals together while assembling homemade fireworks, which led to an explosion,” Sgt. Chris Peltack said in a statement. The man, whom police did not identify, refused medical attention and the house was later “deemed habitable by…