Twenty people were arrested yesterday after raids on foot-reflexology centres across Hong Kong in an operation targeting illegal workers. The Immigration Department began operation Fastrack about 3pm as it widens its campaign against employers who hire workers illegally. Sixteen such centres - in Causeway Bay, Wan Chai, North Point, Tsim Sha Tsui, Jordan, Cheung Sha Wan and Tseung Kwan O - were searched. Fifteen mainland visitors who had arrived in Hong Kong on two-way permits were arrested. The 10 men and five women, came mainly from Jiangxi and Guangdong. Five local employers were also arrested - one man and four women. All those arrested have been detained for further questioning and the operation is continuing. In another sting conducted by the department in a flat being decorated in Wan Chai, three suspected illegal workers were arrested. Their employer, a Hong Kong man, was also held. Visitors breaching their conditions of stay face a maximum fine of $50,000 and two years' imprisonment. The maximum penalty for employing illegal workers is a fine of $350,000 and three years' jail.