Police have expanded the search for the missing Russian siblings, deploying two police dogs to help locate them after investigators traced their last known mobile phone signals to an area near Khao Chi Chan in Chon Buri. The siblings disappeared after leaving their home on a rented motorcycle during the early hours of July 26. Police dogs Yaya and Hunter were deployed after being given clothing belonging to the missing siblings to establish their scent. Police said the expanded search was launched after investigators analysed mobile phone data. The siblings’ last known phone signals disappeared shortly before 5am on July 26 in an area between Siri Charoen Wan Forest Park and Khao Chi Chan.