Chinese police have concluded that an 18-year-old, who was influenced by religious extremism, was the mastermind behind the murder of a state-backed imam in China's western Xinjiang region, state media said on Monday.

In late July, three suspected Islamist militants armed with knives and axes attacked Juma Tayir, a well-known pro-government Uighur who led prayers at China's biggest mosque, in Xinjiang, according to Chinese authorities.

Two of the attackers were later shot dead by police while the third, Nurmemet Abidili, was arrested.