The UK has denied involvement in the arrest and extradition of Nnamdi Kanu, who leads a banned group seeking a breakaway state in south-eastern Nigeria, where the ethnic Igbo people form the majority.
Mr. Kanu, who holds British and Nigerian citizenship, was detained on Sunday with the help of Interpol and flown back to Nigeria, according to the attorney general.
He faces treason-related charges in Nigeria, but fled the country in 2017 while on bail.
There has been speculation that he might have been arrested in the UK, where it is believed he was mainly based.
He is currently in the custody of Nigeria’s secret police after a brief court appearance on Tuesday.
His trial is expected to resume on 26 July. END