Nigerian police fired teargas on Monday and occupied major roads in the capital Abuja to stop demonstrations called to protest the continued detention of separatist leader Nnamdi Kanu, who is on trial facing terrorism charges.

Kanu, who holds British citizenship, leads the banned Indigenous People of Biafra Movement (IPOB) that advocates for the secession of southeastern Nigeria, where the majority belong to the Igbo ethnic group.

In central Abuja, armed police patrolled with water cannon and armoured trucks, and fired volleys of teargas where protesters tried to gather. In other parts of the city, police were supported by armed soldiers in a show of force.

Kanu's supporters say his detention since 2021 is politically motivated and want him released and the seven counts of terrorism quashed. Kanu has pleaded not guilty to the charges, which carry life sentences.

More than a million people perished in a three-year civil war that began in 1967, the year Kanu was born, when the southeast region attempted to secede as the Republic of Biafra.