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Niko Kadi, founder Allans Ademba.

Police have detained 'Niko Kadi' mobiliser Allans Ademba in Ol Kalou, the activist said, as residents voted Thursday in a fiercely contested parliamentary by-election.

Ademba, who leads the youth voter registration movement with a large social media following, said he was taken to the Ol Kalou offices of the Directorate of Criminal Investigations.

"I've been arrested. Niko Ol Kalau DCI," Ademba posted on his X account.