Thai police are looking for a Portuguese man in their investigation of the mysterious deaths of Quebec sisters Noemie and Audrey Belanger, QMI Agency has learned.

A source in the Asian country says surveillance video at a hotel on Phi Phi island shows a man leading the women to a room. The source says the women appeared to be ill in the video.

A maid discovered the bodies Friday morning on the popular tourist island after the sisters failed to answer their door for several days.

Thai officials quickly ruled out foul play and the bodies were sent to the police medical examiner's office in Bangkok for autopsies.

Their uncle, Eric Belanger, said autopsies were performed on Tuesday but the results won't be known for several weeks.

In the meantime, the sisters' bodies are expected to be put on a plane Thursday and sent back to their hometown of Pohenegamook, Que., about three hours northeast of Quebec City.

Eric Belanger said the return of the bodies is "bittersweet" and he thanked Canadian embassy officials for handling the matter quickly.

A second autopsy will be performed on the bodies once they're returned to Canada.

A Thai doctor who briefly examined the Belanger sisters said this week he believes they might have died after eating toxic mushrooms or potentially deadly puffer fish.