Passengers line up and wait for a security check during morning rush hour at Tiantongyuan North Station in Beijing
Passengers, seen through glass, line up and wait for a security check during morning rush hour at Tiantongyuan North Station in Beijing May 27, 2014. Beijing tightened security checks at subway stations since last Saturday, following an attack in China’s troubled Xinjiang region which killed 31 people on May 22, the deadliest act of violence in the region in years. REUTERS/Jason Lee (CHINA – Tags: TRANSPORT CRIME LAW CIVIL UNREST)