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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
Passengers line up as they wait for a security check during morning rush hour at Tiantongyuan North Station in Beijing. Reuters
A paramilitary policeman drinks from a bottle next to his shields as he stands guard at a check point next to the Great Hall of the People near the Tiananmen Square, in Beijing. Reuters
Passengers line up and wait for a security check during morning rush hour at Tiantongyuan North Station in Beijing. Reuters
Passengers line up and wait for a security check during morning rush hour at Tiantongyuan North Station in Beijing. Reuters
A passenger gestures as he lines up and waits for a security check during morning rush hour at Tiantongyuan North Station in Beijing. Reuters