A security officer stands guard as passengers line up for a security check during the morning rush hour at Tiantongyuan North Station in Beijing. (Jason Lee/Reuters)
The Beijing Subway may be the busiest in the world, with 16 lines completing more than 10 million passenger rides a day. That's an impressive feat, but it also represents a serious security problem – especially in the wake of a bomb attack at a train station in Urumqi last month that left three dead...
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