One of the four people who died in Saturday's plane crash in the Northern Alps was still alive after the accident and used a cellphone to call for help, the company that owned the aircraft said.

"Help! May body is trapped and I can't move," New Central Airservice quoted Katsuki Kasai, one of the four people aboard, as saying. The 21-year-old was in the back seat when their single-engine Cessna 172P went down in heavy fog in the town of Tateyama, Toyama Prefecture.

He called at around 2:50 p.m., about 30 minutes after the plane took off from Toyama Airport for the short training flight to Nagano. When an employee answered, Kasai repeated "Help!"