SAN DIEGO (AP) — Investigators say an oil leak caused a Marine fighter jet to crash in a Southern California neighborhood last year, setting several homes on fire and destroying the aircraft. The report says the AV-8B Harrier went down on June 4, 2014 after a crack in an oil drain tank caused a leak that sparked a fire, engine failure and total loss of flight control. The pilot ejected and the plane crashed in Imperial, about 90 miles east of San Diego.