A man who killed a policeman in Lanzhou , Gansu province , this week was shot dead by a police sniper last night after abducting a hostage on Wednesday. After a day-long stand-off, 39-year-old Fu Xiaolin was shot dead at 8.23pm. Two hours earlier police had fired more than a dozen tear gas canisters towards him, local newspaper Xi Bu Shang Bao reported live via the internet. It said a 78-year-old hostage, believed to be Fu's cousin, was rescued in the afternoon. No police officers were injured during the operation. Citing police sources, Xi Bu Shang Bao reported that a bloodied handgun and an Audi car, believed to have been dumped by Fu, were found near the city's Yantan neighbourhood. Yesterday morning, Lanzhou police received a tip-off from a member of the public that Fu had returned to Chengguan district and was hiding in a building in Hantan, the paper reported. Police squads quickly surrounded the building and the stand-off began. Negotiators were sent in, along with two ambulances, snipers, armed police and the city's party chief. Up to 400 members of the public also looked on. Attacks on policemen and soldiers are rare on the mainland, and the shooting of 30-year-old special police officer Dou Yong on Tuesday night shocked the nation. Fu, who had two daughters aged 17 and ten, shot Dou, a member of the mainland's equivalent of a special weapons and tactics team, in the neck while he was investigating a domestic violence complaint. Media reported that Fu had attacked his wife late on Tuesday afternoon over a suspected extramarital affair. He took a handgun from his bedroom and fired a shot at his wife, but missed. She escaped and sought help at a nearby police station. Police were sent to Fu's home on Nanbinhe Road, but the ensuing stand-off turned violent, with people at the scene saying they heard a gunshot. Fu had fled by the time Dou's body was found. Passengers and vehicles leaving the city were inspected by armed police at checkpoints on Wednesday, and wanted posters bearing a photo of Fu were posted across Lanzhou. A reward of 100,000 yuan (HK$113,500) was offered for any significant information leading to his arrest. Mainland media said Dou had sacrificed his life in the attempted arrest. More than 2,000 members of the public paid tribute to him at his funeral yesterday. Xinhua said Fu had a criminal record and a history of drug abuse. Mainland media reported that Fu had been charged with attempted murder when his mistress was found dead after falling from her apartment building following a quarrel in July 2008. He got into trouble with the law again in June last year, when he was arrested for gambling in a pub. Fu was a native of Wang Mang village, in Changan, Shaanxi , and used to be a vendor in the Zhangsu wholesale vegetable market in Chengguan district.