Police will investigate whether the man accused of killing prostitutes at their one-woman brothels had links to other similar cases, a court heard yesterday. Hong Tsz-ying, 23, a decoration worker, appeared in Kowloon City Court over the murders. He faces two murder counts over the deaths of Kwan Suk-yee, 47, who was found in Yee On Street, Sau Mau Ping, on January 10, and a Thai woman, Wong Amporn, 38, who was found in her flat in To Kwa Wan Road on January 31. Hong entered no plea to the charges. The prosecutor told the court the prostitutes were found dead at their workplaces, and valuables including a mobile phone were stolen. She said the police would investigate to see whether Hong was linked to other cases. 'If there's evidence showing Hong might have links, an identification parade would also be arranged,' she said. Autopsy reports indicated the pair were suffocated, the court heard. Police said Hong sold Wong's mobile phone at a second-hand shop on February 2. He was arrested at his home in Lok Wah South Estate in Sau Mau Ping two days later. Hong showed no emotion in court. He was wearing the same clothes as when he was escorted last week to the one-woman brothels. Acting principal magistrate Amanda Woodcock adjourned the case to February 12, pending further investigation. Identification parades are to be conducted, including one arranged with the person in charge of the shop, the prosecutor said. Prostitutes' welfare organisation Zi Teng has said more than 100 women working in one-woman brothels had installed digital cameras since late last year to protect themselves. The organisation's spokeswoman said the group had given prostitutes a HK$500 subsidy to install security cameras, which cost up to HK$2,000. Another 300 prostitutes had installed alarms linked to a security company. Prostitutes fear they could be increasingly targeted by criminals seeking easy cash during the financial downturn. Police believed the Sau Mau Ping and To Kwa Wan murders occurred during robberies that went wrong. Officers had found signs of ransacking at the scenes. Nine prostitutes have been killed in the past year, eight in one-woman brothels. January saw three killings in brothels. On January 11, the body of a woman was found in the first-floor corridor of a building in Chuen Lung Street, Tsuen Wan. The woman, believed to be from the mainland and in her 30s, had worked for less than a week as a prostitute. A police source said they were seeking a mainland man.