British actress Natasha Richardson, who suffered a serious head injury after falling in a ski lesson in Mont Tremblant, has left a Montreal hospital and has been transported out of the country.

Richardson was reportedly taken to a facility in New York City, but the condition of the Tony-award winning actress is unknown.

Michelle Simard, a spokesperson for H�pital du Sacr�-Coeur de Montr�al, said Richardson left Canada at about 12:30 Tuesday afternoon.

Richardson was skiing on a beginners' hill at Mont Tremblant on Monday when she fell, according to resort spokesperson Lyne Lortie.

"She was at the middle of the slope and she didn't seem to fall very violently at all," Lortie told CTV Montreal.

She added that Richardson was not wearing a helmet, which is not mandatory on Quebec ski hills.

Ski patrol accompanied Richardson to her hotel room, where her ski instructor stayed until she reported feeling unwell.

Staff called an ambulance, which brought her to the Centre Hospitalier Laurentien in Ste-Agathe. She was later transferred to Sacre Coeur.

The Toronto Star reported that Richardson was later taken by ambulance to Pierre Elliott Trudeau Airport and left in a private jet. The newspaper said Richardson's husband, actor Liam Neeson, was with her and he looked extremely worried.

Media reports have conflicted widely about Richardson's condition. But Quebec neurosurgeon Dr. Judith Marcoux said it was a positive sign Richardson was still walking after her fall and was later able to be airlifted to New York.

Richardson is the daughter of actress Vanessa Redgrave.

Her husband was filming the movie "Chloe" in Toronto with Julianne Moore. A source from the set said Monday that Neeson has left Toronto to be with his wife in Montreal.

"Liam Neeson left the Toronto set immediately to fly to Montreal upon news of his wife's accident," a rep for his film said in a statement to CTV that was published on a number of websites. "We do not have any details at this time but we hope for the best and our thoughts and prayers are with Natasha and Liam and their family."

Representatives for Richardson and Neeson have not yet commented on the reports.

Richardson, 45, has appeared in dozens of films, including "The Handmaid's Tale" and "Maid in Manhattan."

She also won a Tony Award 1998 for her Broadway turn in the musical Cabaret.

The couple have two children: Michael, 13, and Daniel, 12.