NEAR WHITTIER (CBSLA.com) — Authorities say the pilot of a Bell 47 helicopter was injured in an emergency landing at a park in an unincorporated area of Los Angeles County.

The Federal Aviation Administration says the helicopter rolled on its side during the landing after it lost power.

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The incident was initially reported by fire officials as a chopper crash.

The situation unfolded Saturday morning about 9:26 a.m. near the intersection of Potrero Avenue and Lerma Road in Whittier Narrows, a recreation site.

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The Los Angeles County Fire Department says the incident occurred near the tennis courts and caused a fuel leak of about 100 gallons.

A hazardous material team was also dispatched to the site.

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The FAA also said that a passenger in the chopper sustained minor injuries. However, that person declined medical treatment, according to firefighters.