The crowd is aggravated by dispute over confiscated motorcycles.
A rights group meanwhile warns that Ilham Tohti remains at high risk of torture and ill-treatment as long as he is in custody.
But little is known about the fate of his two business partners.
Chinese authorities inform their families of the charges against them.
Ilham Tohti could face a life sentence, but his lawyer says there is little evidence to support the charges.
Tohti's family has yet to receive any official documents regarding his detention or the charges against him.
A Uyghur exile group blames the latest incident on China’s ‘violent’ policies.
He underlines his fears in a lengthy statement months before he was held on Jan. 15.
His mother breaks her silence over his whereabouts after more than three years.
Violence rocks a township in Aksu prefecture.