A Walnut Creek, Calif., woman who disappeared almost four weeks ago on her way to attend a film in Berkeley was found safe in Salt Lake City late Monday.

Donna Oh, 35, a nurse and mother of two daughters, called an ambulance from a Salt Lake motel Monday night and was taken to LDS Hospital, said FBI spokesman James Screen.There, Salt Lake police said she apparently told doctors she had been kidnapped and raped and then phoned police.

"We talked to her and determined it was best to get her back to the Bay area as soon as possible," Screen said. "We didn't have too much of a chance to talk to her."

Police in the Bay area have suspected foul play since Nov. 2 when Oh called her daughter and told her she was having car trouble. Officers later found Oh's Volkswagen with the keys in the ignition. The car was parked near the Pacific Film Archive, where the single mother was to attend a film as a college class assignment.

But Salt Lake police indicated there were questions regarding the validity of her story. The investigation is being conducted by FBI and police officials in Berkley, Calif., who called a press conference for Tuesday afternoon.

Oh arrived at Oakland International Airport at 9:55 p.m. Monday aboard a commercial flight. Surrounded by FBI agents and police, Oh disembarked the plane via a portable staircase and was immediately placed in a waiting police car.

"I couldn't be happier. This is going to be the best Christmas ever," said Lisa Fernandes, Oh's 19-year-old daughter, who assisted in a manhunt after her mother's disappearance.

Oh's other daughter, 12-year-old Aimee Okoniewski, said she first heard her mother had been found from her friend's mother when she went over to their house Monday afternoon.