The former warden of a prison in Tajikistan's northern city of Khujand has been handed a prison sentence over a deadly riot in November in which dozens of people were killed, a Tajik official has told Radio Liberty’s Tajik Service on condition of anonymity.

An official at the Tajik State Penitentiary Directorate, who asked not to be named because he was not authorized to talk publicly on the matter, told RFE/RL on June 7 that Faizullo Safarzod was found guilty of abuse of office and negligence and sentenced to four years in prison.

It is not clear when exactly the verdict and sentence were pronounced, as Tajik authorities have been reluctant to disclose any information related to the riot since it took place on November 7.

Safarzod's relatives and his lawyer refused to talk to RFE/RL.

The Islamic State (IS) group said in a statement that the riot broke out after one of its "soldiers" detained there attacked a prison guard.

The penitentiary -- the high-security prison No. 3/3 -- largely houses inmates convicted on charges related to terrorism, extremism, and other serious crimes.

Last month, another prison riot in Vahdat Township, some 15 kilometers east of the capital, Dushanbe, claimed the lives of three prison guards and 29 inmates, including three opposition politicians.