Seven people were killed and 31 injured in three separate bomb attacks over the weekend. One of the blasts took place at a Carrefour shopping centre in Wuhan, the capital of Hubei province, newspapers reported yesterday. A bomb exploded in a hallway between a Kentucky Fried Chicken (KFC) restaurant and the shopping centre in the city's Hanyang district on Sunday, the Wuhan Evening News reported. Three people were hurt. An 18-year old migrant worker suffered injuries to his left eye and was awaiting surgery to have it removed last night. Police are still investigating the case and refused to comment. Officers found batteries, wires and some scraps of paper at the scene and believed the device was a homemade bomb. French retailer Carrefour was the target of bombings in three cities in late 2001, while the US-owned KFC was this year targeted in a series of bombings in Xian, Shaanxi province. Police in Yichang blamed a member of a geological survey team for launching an arson attack on his colleagues on Sunday, which left four people dead and 23 injured. They said Liu Jiangping, 44, set a company workers' dormitory ablaze after a row with his superior. He also threw a bomb at firemen and medical workers. Liu killed himself shortly afterwards. Police discovered another bomb at the scene that failed to explode. Among those killed was a pregnant woman, the Chutian Metropolitan newspaper reported. Three people were killed and five injured when a bomb exploded in Baoji in Shaanxi late on Sunday. Witnesses said the bomb was concealed in a metal box and was dropped off by a vehicle in a residential area. Bombings have become a serious problem in recent years. People attribute the incidents to high unemployment and easy access to explosives.