An increasing number of prostitutes from the mainland arrested in Hong Kong are coming in on business visas, police said yesterday. Speaking after the latest crackdown in Mongkok netted 110 sex workers, Chief Inspector Cheung Kin-kwong said about 40 per cent of those arrested had entered on business visas. Previously, most of those arrested in Mongkok were found to have been admitted as tourists, he said. Mr Cheung said police had asked the Immigration Department to discuss with mainland authorities how they could tighten vetting of business-visa applicants. Police Commissioner Tsang Yam-pui addressed the issue this week during his meeting with Assistant Public Security Minister Meng Hongwei. Both officials said afterwards they would step up efforts to prevent business visas being used by mainlanders wanting to enter Hong Kong to commit crimes. On Wednesday afternoon, officers caught about 60 mainland prostitutes soliciting clients in Canton Road, Soy Street, Shanghai Street, and Portland Street. A further 50 mainland women were arrested when officers raided more than 70 locations, mainly short-stay hotels, in the district.