Three children and a teacher have been stabbed to death in an attack on a kindergarten in eastern China. A man armed with a knife forced his way into the nursery at about 4pm yesterday by posing as a parent, as mothers and fathers were picking up their children, according to residents who live nearby. About 20 pupils and staff were injured, two of the children seriously, in the attack in a suburb of Zibo in Shandong province, eastern China. Police rushed some of the wounded from the Boshan District Experimental Kindergarten to hospital before ambulances had arrived. 'Three kids...