BEIJING (AP) — Chinese authorities say an 18-year-old man who used what they called terrorist videos and other multimedia to enlist followers masterminded the slaying of a pro-government Muslim leader.

The state-controlled Xinjiang Daily reported Monday that Aini Aishan organized the July 30 attack on Jume Tahir in the western region of Xinjiang. The victim was the state-appointed imam of China’s biggest mosque and often spoke in support of government policies.

The report said police arrested Aini two days after the attack in the city of Hotan, also in Xinjiang.

Members of China’s ethnic Uighur minority, who are Muslims, have long chafed against Chinese government rule in Xinjiang. Chinese officials have recently cracked down on the use of video and social media to stoke opposition to Chinese policies in the region.