Thursday September 4 11:35 PM EDT Paris Police Hold Photographers in Diana Probe By Alister Doyle PARIS (Reuter) - Police were holding three photographers on Friday in a possible prelude to adding them to a manslaughter probe into whether paparazzis were to blame for Princess Diana's fatal car accident in Paris. Police have also widened their investigation to question employees of the Ritz Hotel, where Diana ate her last dinner and which gave her a driver who was far over the drink drive limit when her car crashed on Sunday. Suspicions that hounding by paparazzi on motorcycles was a factor were bolstered by a man who said he saw a motorcycle swerve in front of Diana's black Mercedes car just before it slammed into a concrete post on Sunday. The three freelance photographers, aware they were sought in a manslaughter investigation because they had been at the scene of the crash, turned themselves in to police of their own free will on Thursday, justice sources said. They were being held overnight for questioning and might be added to a probe already targeting six other photographers and a picture agency motorcyclist. The seven were placed under official investigation on Tuesday for manslaughter, causing bodily harm and failure to help people in danger. If ever tried, they could risk up to five years in jail for the deaths of Diana, her companion Dodi Al Fayed and their driver. Investigators are likely to spend months, perhaps years, dissecting how far speed, alcohol or paparazzis were to blame. A judicial source said police had begun questioning employees at the Ritz Hotel, owned by Al Fayed's multi-millionaire father Mohamed who also owns London's Harrods department store. "The visits to the Ritz were routine, as is always the case in this type of investigation," the source said. The Ritz had no immediate comment. Police said that they had not ruled out a possibility that the Ritz or its employees might be made a formal target of the investigation. Photographers have said they were far behind the Mercedes at the time of the accident. Al Fayed's lawyers argue the car would not have been speeding if the posse of paparazzi had not been in pursuit. Backing up Al Fayed's case, a man who said he was driving just ahead of Diana's car told Reuters that a swerving motorcycle may have put off the driver. "In my rear-view mirror, I saw the car in the middle of the tunnel with the motorcycle on its left, pulling ahead and then swerving to the right directly in front of the car," Francois Levi said from his home in the Normandy port of Rouen. "As the motorcycle swerved and before the car lost control, there was a flash of light but then I was out of the tunnel and heard, but did not see the impact," he said late on Thursday. There were two people on the motorcycle, Levi said. He said he did not know if the flash was from a camera. Photographers placed under investigation, including some who arrived minutes after the accident, have denied any wrongdoing. Some witnesses have said they shoved aside rescue workers or police to get pictures. Investigators have also been poring over telephone records to see whether the paparazzi on the scene tried to help the victims by calling the police or giving first aid. A French law obliges onlookers to help people in danger.