Cross-border passengers heading to a popular housing estate in Shunde now have to be photographed before they board buses as part of new security measures introduced following a robbery on Saturday. A manager, surnamed Zhu, from the Country Garden estate in Shunde, told Cable TV the measure had been in force since Sunday as a deterrent. About 30 passengers heading to Country Garden in Shunde and Clifford Estate in Panyu on Saturday, including 20 Hongkongers, were robbed of about $300,000 in cash and valuables by four men and a woman posing as passengers. Seven local victims, who later reported the case to the Hong Kong police, told investigators the robbers were armed with a gun and cutters. Liu Yingli , executive vice-mayor of Shenzhen, said yesterday Shenzhen authorities attached great importance to maintaining public order. Mr Liu, who was attending a seminar at Chinese University, said the Shenzhen Public Security Bureau had increased its staffing in the past few years and an extra 2,000 officers would be hired this year. He sought to play down Hong Kong people's concerns over public order in Shenzhen, saying the crime rate in the special economic zone had, in fact, been falling in recent years.