STEVENSON, Wash. (AP) _ A small float plane crashed into the Columbia River on Saturday, killing four people, authorities said.

The float plane, a De Havilland Beaver, dived into the river 45 miles east of Portland, Ore., about 3 p.m., landing upside down near the Washington state shoreline, said Lt. Mike Stone of the Coast Guard.

The plane was believed to have been piloted by the chairman of the Portland-based Macheezmo Mouse restaurant chain, according to a report by The Oregonian.

William S. ``Tiger'' Warren, 48, was traveling with his children after a Thanksgiving gathering, family members told the newspaper.

Dive teams retrieved two bodies _ a man believed to be Warren and a child, the Oregonian said. But technical difficulties and inclement weather forced them to delay recovery of the other two bodies until Sunday.

Warren was the founder of Macheezmo Mouse, which zoomed to popularity as a healthy way to enjoy Mexican food. After going public in 1994, the 13-restaurant company faced cutbacks. In late 1995, Warren stepped down as chief executive officer but retained the title of chairman of the board.

His three sons, aged 9, 13 and 14, were in the plane with him, the Oregonian said.

The Federal Aviation Administration in Seattle said it can't determine where the flight originated until it gets the plane number.