PHUKET: Two Canadian sisters who died mysteriously on the popular resort island of Phi Phi in 2012 may have ingested toxic amounts of a lethal pesticide called aluminum phosphide, reports Canadian news network CBC.

The highly toxic pesticide is used to control bedbugs in some holiday hotels in Asia and may have contributed to the deaths of Audrey and Noemi Belanger, as well as several other tourists, according to new evidence from an investigation by CBCs the fifth estate and Radio-Canadas Enquete.

The Belanger sisters were found dead in their room at the Phi Phi Palms Residence on June 15, 2012, covered in vomit, with similar signs of trauma on their bodies and blue fingernails and toenails (story