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Security 'tense' after deadly China attack

23 May 2014 Last updated at 17:19 BST

Security has been tightened in China's north-western region of Xinjiang after an attack on Thursday that left 31 people dead.

Two off-road vehicles drove straight into crowds of shoppers before several explosions were detonated in the city of Urumqi.

John Sudworth reports that the same region has seen a number of similar incidents in recent months - which have been blamed on Muslim extremists from Xinjiang's Uighur population.