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Investigators on Wednesday answered some of the questions surrounding a skiing accident that left champion auto-racer Michael Schumacher with a severe brain injury.

Officials told a news conference that they have analyzed footage from a camera strapped to the Schumacher's helmet and ruled out problems with his skis, trail conditions and signage in the Dec. 29 crash at the Meribel resort in the French Alps.

"The footage is extremely clear and gives us a good deal of information, or at least confirms the information we already had," prosecutor Patrick Quincy said.

Investigators could not determine the exact speed of the ex-Formula One champion but Col. Benoit Vinneman told the news conference in Albertville, France, that it was "completely normal for a skilled skier."

Schumacher has been in a medically induced coma since the crash. He has had two operations and remains in a stable yet critical condition.

He had been skiing just off a groomed run when his skis hit a rock, causing him to lose balance and hit his head on another rock, officials said.

They said the edges of the run were marked clearly and within French regulations.

Local police chief Stephane Bozon said Schumacher's skis were rented and almost brand new. Experts are also examining Schumacher's helmet, which was no longer "in one piece," according to one investigator. They said the investigation will continue, possibly for weeks.

On Tuesday, Schumacher's wife, Corinna, asked the media in a written statement to leave the hospital, where journalists had crowded for days awaiting news on the medical condition: "It is important to me that you unburden the doctors and the hospital."