ONAWA, Iowa (AP) — A 76-year-old man has died in a house explosion in Onawa. Fire crews were called to the home about 11:30 p.m. Saturday. When they arrived, the house was engulfed in flames. Firefighters found the man’s body in the basement of the home after the fire was put out. He was identified by police as Richard Collison. The state fire marshal is investigating the cause of the fire.