June 9 (UPI) -- All six people aboard a twin-engine Cessna 414 died when the small plane went down in the Pacific Ocean off the San Diego coast, the Federal Aviation Administration confirmed Monday.

On Sunday afternoon, the plane crashed "under unknown circumstances into the water" after an "initial climb," the FAA said Monday.

The Cessna, which was returning to Phoenix Sky Harbor International Airport, went into the water 3 miles west of Point Loma, minutes after taking off from San Diego International Airport. The U.S. Coast Guard in San Diego received the first report at 12:45 p.m. PDT.

The occupants included a pilot and five passengers.

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