The plane crash was reported shortly before 5:30 p.m. near the Trump National Golf Club, according to the Los Angeles County Fire Department.
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The incident occurred after the aircraft sustained a "catastrophic mechanical failure," a Fire Department spokesperson said.
The plane ended up completely submerged in the ocean waters, its location later marked by responding lifeguards.
No major injuries were reported. News video from the scene showed both the pilot and his dog walking unassisted.
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Federal Aviation Administration investigators are expected to arrive at the scene Monday.