A Nigerian court on Thursday convicted separatist leader Nnamdi Kanu on all seven terrorism-related charges and sentenced him to life imprisonment.

Kanu, founder of the Indigenous People of Biafra (IPOB), has been accused of terrorism and extra-judicial killings in the country’s southeastern region, where the group campaigns for an independent Biafra state.

The charges against Kanu, who has rejected the court’s authority, included carrying out acts of terrorism, issuing and enforcing violent stay-at-home orders that paralyse the region every Monday, providing guidance on making explosives for use against government facilities, and incitement.

Presiding Judge James Omotosho stated that “the right to self-determination is a political right,” but added: “Any self-determination not done according to the constitution of Nigeria is illegal.”