The National Transportation Safety Board says a fiery plane crash that seriously injured two people last year was caused by engine failure.

The June 17th, 2007 crash happened as 79-year-old Hilton Mouldin and his son, Hank, were taking off from Washington's Warren Field. Both were listed as student pilots.

The probable cause report on the crash was released last week.

The NTSB says the Stinson airplane lost engine power shortly after takeoff. The report says the plane didn't have sufficient altitude to glide back to the airport, so the pilot tried to land in a field.

The plane stalled over the field, and initially struck ground on it's right landing gear, bounced and nosed over, according to the report. The NTSB said the Sinson became engulfed in flames.

The NTSB says both onboard only held student pilot certificates and had purchased the 1947 airplane six months before the crash.