Boyfriend suspected in death of helper, 24 Two 16-year-old boys have been arrested on suspicion of killing an Indonesian domestic helper who was stabbed to death at a dog-training farm in Fan Ling last week. Officers also believe the boys - one of them the maid's ex-boyfriend - were linked to an attack on December 1 in which the victim, 24, identified as Fitriani, was beaten with a flashlight and had her head rammed against a wall. Yesterday, the two Hong Kong Chinese suspects led police to a bloodstained knife, a flashlight, two balaclavas and two gloves and helped them reconstruct the killing. One is a former employee of the North American Working Dog Association (Far East) kennel in Kau Lung Hang Village and also the helper's former boyfriend. Police said the pair had broken up after he quit the kennel a few months ago. 'It is possible that the woman was killed after she refused to be reunited with him,' a police source said. The second suspect was a friend of the other teenager and knew the woman, whose employer, Wong King-kok, 58, ran the association's dog activities department. Superintendent Steve Li Wing-hong, of the New Territories North regional crime unit, said the two teenagers were arrested after officers focused on the 'social circle of the deceased'. 'During our investigation, we interviewed all her friends, workmates and employees of the kennel. As a result, we found the two suspects and arrested them,' he said. The boys, who are unemployed, were arrested at the New Territories North police headquarters in Tai Po on Monday night after being invited by police to assist inquiries. 'We believe we have arrested all the persons involved in the two cases,' Mr Li said. The motive for the killing had not been firmly established, he said, but 'we don't dispel the possibility of love affairs or other possible motives'. Police said one of the suspects helped police recover the weapons yesterday morning. The other was taken, hooded and chained, to the kennel in Kau Lung Hang Village at 4pm to reconstruct what happened. Describing the killing as 'brutal', Mr Li said the helper was stabbed more than 20 times outside a hut in the kennel on the night of January 22. 'She was attacked from behind. She was caught by surprise,' he said. The woman's boss found her body when he arrived to work at 8.30am the next day. After last month's attack, the woman was moved to the kennel complex, where it was thought she would be safer. The maid was assaulted on December 1 when two masked attackers rushed into her employer's home in Yuen Leng Tsuen, not far from the kennel. Police said the two boys were expected to face a joint murder charge. Last night they were being held for questioning but had not been charged. Fitriani's was the second murder in the city this year. On January 17, taxi driver Lei Seng-chi, 47, was killed by a blow to the head on a Sai Kung hillside. The killer is still at large.