Firefighters extinguishing a predawn blaze Thursday that engulfed a parked motor home in San Ysidro found a man’s body inside. A witness reported hearing an explosive sound and seeing the recreational vehicle catch fire on West Calle Primera just south of Interstate 5 around 5:30 a.m., according t o the San Diego Police Department. Emergency crews pulled the unresponsive man out of the burned motor home and tried to revive him before pronouncing him dead at the scene, Sgt. Saum Poorsaleh said. The victim’s identity was not immediately available. The cause of the fire was under investigation, though it appeared to have been accidental in nature, Poorsaleh said. ...read more read less