Sunday Adeyemo, popular Yoruba activist, has reportedly been arrested outside the country.
Mr Adeyemo popularly known as Sunday Igboho, according to The Nation, was arrested in Cotonou, Benin Republic.
Mr Igboho was said to have been picked up on Monday night at the international airport en route Germany.
His arrest comes weeks after Nnamdi Kanu, the detained leader of Indigenous People Of Biafra (IPOB) was similarly picked up in Kenya.
President Muhammadu Buhari had recently threatened that his administration is going to adopt the language separatists understands.