The four "rioters" drove up to a local party office in Moyu County and "detonated an explosive device", killing one person and injuring three others. They were shot dead by the police.
Anti-terrorism cooperation: China backs sovereign immunity after US 9/11 bill becomes law
The far-western region of Xinjiang is the homeland of the Uighurs - many of whom complain of discrimination and controls on their culture and religion - and is often hit by deadly unrest.
Beijing regularly accuses what it says are exiled Uighur separatist groups such as the East Turkestan Islamic Movement of being behind attacks in the resource-rich region.
In November 2015, police killed 28 members of a "terrorist group" over the course of a 56-day manhunt following an attack on a colliery in Aksu two months earlier that left 16 people dead.
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