BALTIMORE (AP) — The Air Force says a fighter jet crash near the nation’s capital in April was caused by an issue involving the engine.

[related_gallery align=”right”]The Baltimore Sun reports that Air Force investigators on Thursday said a problem with how the engine was installed caused the F-16 to crash in Prince George’s County, Maryland.

The D.C. Air National Guardsman piloting the plane ejected safely after guiding the $22 million jet toward a wooded area about 3 miles (5 kilometers) from Joint Base Andrews. It was one of four fighter jets flying from Maryland to a shooting range in Pennsylvania for a training exercise.

About 20 homes near the crash site were briefly evacuated at the time and nobody was hurt.

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Information from: The Baltimore Sun, http://www.baltimoresun.com