Rescue crews were searching for three people who were reported missing after a Navy contractor's aircraft went down early Wednesday off the California coast.

U.S. Coast Guard spokesman Levi Read said the aircraft, a Phoenix Learjet, was carrying three people when it plunged into the Pacific Ocean about a mile southwest of San Clemente Island, which is west of San Diego and owned by the U.S. Navy.

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Rescue crews are searching for three people who were aborad a downed aircraft off Southern California's San Clemente Island. (Fox News)

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The Coast Guard, Navy and Customs and Border Protection crews were actively searching the area for the three people, Read said.

The aircraft used by a Navy contractor departed from the Ventura County area, said Drew Verbis, spokesperson for Naval Base Ventura County on the coast northwest of Los Angeles.

He had no other immediate details.