A frame grab taken from TV footage shows two security guards receive treatment at a hospital in Shanghai, August 3, 2009. One security guard was stabbed to death and two got injured when they assisted police to inspect a community in Pudong New Area of Shanghai, August 3, 2009. The police have locked up the suspect. Since the foundation of the People's Republic of China in 1949, there have been 10,768 police officers killed in the course of duty and 151,468 officers injured, said China's Ministry of Public Security (MPS) on Monday August 3, 2009.[Xinhua]

A frame grab taken from TV footage shows the file photo of Zhang Aiming, a security guard stabbed to death when he assisted police in inspection in Pudong New Area of Shanghai, August 3, 2009. The police have locked up the suspect. Since the foundation of the People's Republic of China in 1949, there have been 10,768 police officers killed in the course of duty and 151,468 officers injured, said China's Ministry of Public Security (MPS) Monday.[Xinhua]