Policemen prepare to enter a supermarket after an explosion was reported to the police in Shanghai July 4, 2011. [Photo/Agencies] 

Students go through physical training at an Er Ren Zhuan training school in Qianyingzi village of Xinmin, Liaoning July 4, 2011. Er Ren Zhuan, is a popular folk art performance practised in Northeast China, which usually involves a boy and a girl pairing up to sing and dance. [Photo/Agencies]