Small plane crashes in California prison's exercise yard, officials say

A small plane crashed at a California state correctional facility on Monday, officials said.

The Northrop N-9M crash-landed in the prison yard of the California Rehabilitation Center in Norco, Allen Kenitzer, a spokesperson for the Federal Aviation Administration (FAA) told Fox News on Monday.

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Citing local authorities, the FAA said that only a pilot was onboard the single-engine aircraft. The condition of the pilot was not immediately clear.

It also was not immediately clear if any prisoners were in the yard at the time.

A plane crashed at the California Rehabilitation Center in Norco, California, on Monday, officials said.<br><br>

A plane crashed at the California Rehabilitation Center in Norco, California, on Monday, officials said.<br><br> (Google)

The plane, however, "sustained substantial damage," according to Kenitzer.

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The FAA and the National Transportation Safety Board, which did not immediately return Fox News' request for comment, will investigate the crash.

The medium-security prison facility is located roughly 50 miles east of Los Angeles.

The Associated Press contributed to this report.