A maniac allegedly set himself on fire inside of his family’s Queens home, sparking a massive explosion that left eight officers and at least four other people hurt, according to police and sources. Police responded to a reported domestic dispute involving a knife at a home on 130th Street in South Ozone Park around 2:42 a.m. Thursday — but as officers approached the front door, there was an explosion that was “so powerful it knocked them off their feet,” Assistant Chief of Queens South, Christopher M. Mcintosh told reporters.