At least seven people have been arrested for protesting outside the High Court in the Nigerian capital Abuja where the pro-Biafra leader, Nnamdi Kanu, is appearing to face charges including treason.

There's tight security with roads blocked off and access severely restricted.

Mr Kanu's secessionist group - the Indigenous People of Biafra - has been banned by the government and has been accused of carrying out deadly attacks in the south-east of the country.

He had been on the run for four years after skipping bail.

Mr Kanu holds British citizenship and the circumstances of his extradition back to Nigeria last month are unclear.

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