Motor racing's governing body has started an inquiry into Saturday's Belgian Grand Prix qualifying accident that fatally injured Canadian driver Gilles Villeneuve.

The International Motor Sport Federation announced that its safety inspector, Derek Ongaro, will head the investigation that will attempt to establish the cause of Villeneuve's 170 mph crash in Zolder, Belgium.

Villeneuve, 30, was catapaulted from his Ferrari as it flipped across the track. His safety harness snapped and he was left crumpled by steel safety netting along the track 100 feet from his wrecked car.

Villeneuve's father Seville said his son's body probably would be flown to his hometown of Berthierville, Quebec, for a funeral Tuesday.

Meanwhile, John Watson of Britain won the race in Zolder, overtaking Keke Rosberg of Finland on the next to last lap. Three hours after the checkered flag fell, the McLaren of Niki Lauda, Watson's teammate who had finished third, was disqualified.

At the official weighing of the top six cars, Lauda's McLaren was found to be 4 1/2 pounds under the minimum 1,276-pound limit. His disqualification followed a similar banning of the top two finishers in the earlier Brazilian Grand Prix.

Kiki Rosberg's Williams dominated from the fifth of the 70 laps after early leader Rene Arnoux of France dropped back with turbo failure on his Renault. Entering the final lap, Rosberg made a mistake going into a corner. Watson nipped past and went on to claim his third victory in 126 Grands Prix and denied Rosberg his first victory . . .

Rick Mears, the prerace favorite in this year's Indy 500, showed up for practice for the May 30 race at the Indianapolis Motor Speedway with multiple stitches on three fingers of his right hand. "I was working on an old model 'A' at my home and the fan belt broke."

Saturday night in Nashville, Tenn., pole-sitter Darrell Waltrip won his second consecutive race this season when he beat Terry LaBonte by one lap in the $159,000 Cracker Barrell Old Country Store 420 Grand National stock car race.