At least two children were killed by a knife-wielding man at the entrance of the primary school in Shanghai on Thursday. People tried to help the stabbed children, who were seen lying on the ground, bleeding. Two more people, another student and his parent were also attacked, but their injuries are not life threatening, according to local reports. The suspect, who is reported to be a 29-year... Еще-old man, was seen being tied up and detained by police. The motive behind the attack is being investigated.