China school children attack december 26 2012

This picture taken on December 18, 2012 shows students and a teacher (2nd R) trying to stop an attacker (R) during a drill on a mock attack at a primary school in Jinan, in eastern China's Shandong province. The drill came four days after a knife-wielding attacker stabbed 22 students at a primary school in the central Chinese province of Henan on December 14 in the latest in a series of assaults.