APPOMATTOX, Va. - A bomb squad discovered a multitude of explosives Wednesday at the home of a man accused of shooting eight people to death, and crews were detonating the devices as more details about the suspected gunman came to light. Christopher Bryan Speight, a 39-year-old security guard, surrendered to police at daybreak Wednesday after leading authorities on an 18-hour manhunt following the slayings at a house in rural central Virginia, where deputies found a mortally wounded man and seven bodies. As of Wednesday afternoon, bomb squads had detonated seven explosives. The blasting was expected to continue into Thursday. Speight had no weapons when he surrendered. He was wearing a bulletproof vest over a black fleece jacket, camouflage pants and mud-caked boots. Neither the sheriff nor a state police spokeswoman would disclose what Speight said when he gave up. Authorities remained tightlipped on most details surrounding the slayings, including any possible motive. Nor did they immediately identify any of the victims or their relationship to the suspect. Investigators would say only that he knew his victims.