More than 80 police officers were sent to Tai Tam country park at the weekend to encourage hikers to take extra safety measures after a number of robberies recently. During a two-day operation that ended last night, officers from the Aberdeen division and the Police Tactical Unit handed out pamphlets on safety designed to help deter crime in remote areas. On Saturday, two men robbed a married couple at knifepoint in Lion Rock country park. The couple were forced to hand over $3,000, a mobile phone and other valuables. A week ago, two hikers were stranded in the wilderness for 12 hours and their ordeal ended only after the male victim's mother called her son's mobile phone. A robber told her he had tied her son and his wife to trees in Tai Tam country park. On January 28, two hikers were robbed in Lion Rock country park. Stanley police subdivision commander, Lau Kar-ming, said the force did not see a rising trend in country park robberies. 'We won't underestimate the problem. And before and after the operation, we also have operations to protect hikers from robbery,' he said, adding that people should avoid walking in quiet areas. No one was arrested in the operation. Deputy Police Commissioner Tang King-shing said there were few robberies in country parks. But he advised hikers to walk in larger groups, leave their mobile phone numbers with family members and to be more alert. Mr Tang said commanders in different districts would implement operations to curb these crimes. There were 18 robberies in country parks last year compared with three cases so far this year. Ten people arrested in connection with robberies last year were illegal immigrants from the mainland.