The Coast Guard and ships in the area searched for a fourth day Friday for a 17-year-old student missing from a Japanese training vessel about 70 miles southwest of Kauai.

Both the Navy cruiser USS Lake Champlain, stationed in San Diego, and the Coast Guard Cutter Kittiwake, homeported here, are no longer part of the search effort, which has covered 10,645 square miles.

Still searching are an HC-130 Hercules from Coast Guard Air Station Barbers Point; the Coast Guard Cutter Kiska, homeported in Hilo; and eight Japanese vessels that were in the area.

The male Japanese teen was last seen at about 2:50 a.m. Tuesday and was reported missing after he did not show up for muster. He was last seen wearing a light green jumpsuit. It is not known if he was wearing a life jacket.

The Coast Guard was notified at 9:56 a.m.