A BUSINESSMAN from Shenzhen who said he had been robbed, placed in a sack and dumped on a hillside in Lam Tin on Monday was arrested after leaving hospital yesterday. Police last night confirmed they had arrested 35-year-old Chan Chi-keung and were detaining him for further investigations. Kwun Tong detectives yesterday took him to the Mong Kok railway station. There he claimed he had been approached by three men who forced him onto a goods vehicle which was then driven to Kwun Tong. He claimed he was assaulted and robbed of $2,000, before the men stuffed him into a sack which was bound with chains. He said they dumped him on a hill slope in Lam Tin. Chan was rescued by police and firemen from the hill slope on Monday night. He was found with facial and chest injuries and admitted to United Christian Hospital. It was the second time this year Chan had been assaulted after returning to the territory. Three years ago, he had taken up residency in Shenzhen but in March, he brought $17,000 to Hong Kong to buy goods. While walking in Mong Kok, he was attacked by two men with a hammer, suffering head injuries. His money was stolen. A local Chinese newspaper gave Mr Chan $5,000 to buy milk powder for his son. He had left hospital early, saying he was worried about his lover and child in China.