The Amnesty International is calling for an independent investigation into mass graves allegedly containing the bodies of hundreds of Shiites killed in clashes with the Nigerian military, according to News Week.

Members of the Islamic Movement in Nigeria (IMN)—Nigeria’s largest Shiite Muslim group— clashed with the Nigerian army in December 2015 in the northern city of Zaria, Kaduna state. 

The secretary to the Kaduna state government, Balarabe Lawal, told an inquiry on Monday that 347 Shiites killed in the clashes were buried in a single mass grave. 

IMN spokesman Ibrahim Musa told Newsweek that the burial took place “in the middle of the night” and the families of the deceased were not informed beforehand.

Source: MENA