Two street sleepers who died yesterday after being found unconscious were living in an area laced with rat poison. The names of the women, both believed to be in their 50s, were still unknown as they were not carrying identity cards. They were found lying unconscious, but with no sign of injuries, in a back lane of Shanghai Street, Mongkok, at about 11.30am on Monday and were taken to Kwong Wah Hospital where they died. A hospital spokesman said it had referred the cases to the Coroner who would arrange for post-mortem examinations to be done today. Police said there were no suspicious circumstances. One police officer said: 'We have been told by one of the doctors that their symptoms appeared to suggest they may have taken poison but further tests will have to be done to establish this.' The rat bait includes sugar, oil, rice and racumin - rat poison. Government workers put it in holes near railings on streets. Another police officer described the women, who were said to have been living on the street recently, as being dressed like 'illegal immigrants', wearing several layers of clothing. Pieces of bread and a bottle of water were found near where the women had been staying. Their belongings contained several hundred dollars. The Urban Services Department had put up a warning notice to people in the area saying it had laid rat bait on January 26. A department spokesman said: 'So far, we do not know what caused the women's deaths, but we put a notice up alerting people that we had put down rat bait in the area.' The spokesman said the department did not have any record of a person being affected by rat bait.