Police investigating the chopping down of 188 trees in a Yuen Long country park a fortnight ago are focusing their investigation on drivers who use the road that runs next to the trees. Yesterday they issued an appeal for anyone with relevant information to come forward, as their inquiry into the mass chain-sawing in Tai Lam Country Park continues. Detectives are looking into the possibility that slope maintenance crews or construction workers in the park cut down the trees to make way for bulky equipment, said acting Assistant Tuen Mun District Commander (Crime) Jason Cheung Yiu-sang. They are also investigating whether villagers and a war game company operating in the park cut down the trees so that their cars could travel along the 1km stretch of road without being scratched by overhanging branches. 'The aim of what was done seemed to be to widen the road, rather than an act of malicious vandalism,' Mr Cheung said. 'Some of the trees had been cut down at the main trunk, but there were other trees where only those branches that had earlier been protruding on to the road were lopped off.' He said the one-lane track along which the trees were cut was so narrow that oncoming traffic would have to reverse long distances to forks in the road to pass each other. 'We are looking at perhaps whether the drivers living in the park wanted to drive up to the side of the road so they would not have to back up so far.' The case has been classified as criminal damage. The destroyed trees have been replaced, but a country parks ranger said it would take years for the saplings to grow. Anyone with relevant information is urged to call 2456 5355 or 2456 5208. Police officers are patrolling in pairs instead of alone in Shamshuipo after a constable was stabbed on his beat on Tuesday. 'All along our policy has been to allow frontline commanders to flexibly arrange the number of people in patrols,' said Police Commissioner Dick Lee Ming-kwai. 'After this incident I know commanders at the two divisions of Shamshuipo have arranged for two people to patrol one beat.' Constable Chu Chun-kwok, 30, was stabbed in the neck while checking an ID card. He remains in critical condition. His attacker, 22-year-old Liu Chi-yung, has been charged with one count of wounding with intent and one count of possession of an offensive weapon.