Detectives investigating the rape of a hiker in Tsuen Wan were questioning a suspect last night after sending his saliva for a DNA test. The 44-year-old was arrested on Sunday night after Ha Fa Shan Tsuen villagers saw him acting suspiciously in Tai Lam Country Park. The woman hiker, 48, was raped and robbed on a nearby walking trail on Wednesday. The suspect became emotional and put up a struggle when being arrested and a knuckle-duster was seized. Police said he bit an officer's arm after being put in a van. 'At this stage, the man was arrested for possession of an offensive weapon,' an officer said. 'A saliva sample has been taken from him for DNA tests to find out whether he is linked with the rape. It's too early to say he is the right man.' The suspect lives in Tsuen Wan and is not a villager in Ha Fa Shan Tsuen. He was being detained last night for questioning at Tsuen Wan police station. On Wednesday, a housewife hiking alone on the park's Yuen Tsuen Ancient Trail was attacked on a hilltop at about 8.10am , dragged down a slope and raped. The rapist told her to wash in a stream before fleeing with HK$160 and a mobile phone. A hunt involving 100 police and tracker dogs was conducted for the rapist, thought to be aged between 30 and 40, and about 1.7 metres tall. He was wearing dark trousers and cap, and had a rucksack and umbrella. Anyone with information can contact police on 3661 1215.