CRESCENT, Pa. (AP) — Authorities say a massive explosion killed two people and destroyed a house in the Pittsburgh area near the Ohio River. Allegheny County emergency dispatchers say the blast in Crescent Township in the northwest Pittsburgh suburbs was reported shortly before 9 a.m. Tuesday. Aerial images from the scene show smoking ruins with the structure reduced to rubble and some large pieces lodged in trees above. The Crescent Township fire chief says a man and woman were found dead at the scene. The Allegheny County medical examiner’s office has identified the victims as 89 year old David Mitchell Jr. and 87 year old Helen Mitchell. The cause of the explosion is under investigation.