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The L.A. County Sheriff's Department continues with its underwater search and recovery efforts.
The Federal Aviation Administration said the search efforts were launched when a pilot reported seeing two planes collide at about 5:45 p.m. Tuesday.
Police believe three people were involved in the crash, but there may be more people.
A spokesman for the FAA said both planes flew out of Long Beach Airport. One of the planes was a single-engine Cessna carrying a flight instructor and a student pilot.
The second plane was a twin-engine airplane, but there is no word how many people were on board.
Search and rescue teams worked throughout the night and recovered debris from the crash, including a plane's landing gear.
The Coast Guard dealt with a large debris field, about 10 miles by 20 miles long, and due to ocean currents, it was getting larger.
"At this point, we have recovered a lot of debris, but no indications of survivors at this point," said Capt. Paul Wiedenhoeft from the U.S. Coast Guard.