Security in Urumqi

Security forces block access to the market where Thursday's explosions occurred, Urumqi, China, May 25, 2014. (Fred Wong/VOA)

Armed police in the streets of Urumqi, China, May 25, 2014. (Fred Wong/VOA)

Armed police deployed at the international airport in Urumqi, China, May 25, 2014. (Fred Wong/VOA)

Armored vehicles patrol in Urumqi, China, May 25, 2014. (Fred Wong/VOA)

Following last week's explosions, police are stopping vehicles and questionning drivers in Urumuqi, China, May 25, 2014. (Fred Wong/VOA)

Armed police and armored cars in the streets of Urumqi, China, May 25, 2014. (Fred Wong/VOA)