Updated

A mysterious millionaire and his abducted daughter, Reigh Boss, have been spotted on a Caribbean island having arrived by yacht on Thursday, the FBI has been told.

Clark Rockefeller, 48, has been on the run since snatching his 7-year-old daughter during a visit in Boston, last Sunday.

The manhunt turned to the Turks and Caicos Islands yesterday after reports that the pair had been seen twice on the island of Providencials.

Hubert Hughes, deputy commissioner of the islands’ police, said they had been seen at the hospital at 9:30am on Thursday and five hours later at a convenience store.

In both sightings the girls hair was described as cut short like a boy, said Hughes. “It is a believed sighting, but we’re not positive,” he added.

Click here to watch Sandra Boss' video plea.

Click here for photos.

The FBI has said that it is believes Reigh might be disguised as a boy while her father is using a passport with the name Michael Brown.

Rockefeller told friends he had bought a 72 foot catamaran and planned to sail to the Caribbean or South America. There have been previous unconfirmed sightings of the pair New York and Delaware.

Meanwhile, Sandra Boss asked her ex-husband, Clark Rockefeller, to return their daughter, Reigh Boss, who goes by the nickname "Snooks" in a YouTube video. In the video, released by the Boston Police Department, Boss told Rockefeller that there must be a better way to deal with their differences.

"We both love her dearly and have only her best interests and well-being at heart," Boss said. "I ask you now, please, please bring Snooks back. There has to be a better way for us to solve our differences than this way."

Boss also addressed her daughter.

"I love you, I miss you so much. And remember you're always a princess," Boss said.

The FBI announced Thursday that Clark Rockefeller, who allegedly snatched his daughter Sunday during a visit supervised by a social worker and then fled in an SUV driven by another person, may have disguised Reigh as a boy.

Click here for more on this story from MyFOXBoston.com.

The Associated Press and Times of London contributed to this report.