Former Forum for Democratic Change Kiiza Besigye has been arrested.
Besigye was intercepted by the police as he drove towards Kisekka market.
He walked from London Chambers in the city centre, through Kikubo Lane and was arrested as he approached Kisekka Market.
According the Kampala Metropolitan police Commander James Ruhweza, he has been taken to the Central Police Station.
Earlier the police fired tear gas to block protesters from accessing the market area where business remains paralyzed with shops and all businesses closed.