A Thai doctor who briefly examined two Canadian sisters found dead in a Thailand hotel room believes they might have been killed after eating toxic mushrooms or potentially deadly puffer fish.

Autopsy results are not yet in for Noemie and Audrey Belanger but a hospital director in Krabi, Thailand, told The Phuket News he arrived at his theory following a preliminary examination of the women’s bodies.

Dr. Komkrit Phukrityakame said the Quebec sisters may have been victims of food poisoning after eating puffer fish, also called Fugu, which are one of the deadliest animals on Earth.

The spiked fish contain a strong toxin that’s 100 times deadlier than potassium cyanide if not properly prepared by specialized chefs.

The fish can kill an adult in less than an hour and there is no antidote, but they are still considered a delicacy in Japan and other parts of Asia.

Bangkok police suggested the two sisters suffered “severe food poisoning” after they ate at a restaurant last Tuesday. The pair returned to their hotel room on Phi Phi Island, a popular tourist spot in southern Thailand.

A maid discovered the bodies Friday morning after the women didn’t answer their door for several days, according to The Phuket News.

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

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