Fire crews attempting to knock down a West Deer blaze Wednesday were hampered by heavy rounds of ammunition exploding in the back of the home, authorities said. “When we got on scene, there was heavy fire — about 60% involved — and a solid half-hour of ammunition going off,” said Anthony Creaturo, chief of West Deer Volunteer Fire Department No. The victim was identified late Thursday as Van Laskey, 71, by the Allegheny County Medical Examiner’s Office. Josh Wiegand, chief of West Deer No. Crews from surrounding municipalities and from Butler County responded.