Ugandan opposition leader Kizza Besigye has been arrested three weeks after he returned home from four years in exile.
Police used tear gas to disperse thousands of his supporters outside the police station where he is being held.
Police say Dr Besigye will be charged with treason after accusing him of belonging to two rebel groups. Mr Besigye has denied the allegations.
He is seen as the strongest challenger to Uganda's President Yoweri Museveni in elections due next March. Kizza Besigye and his wife are both former Museveni allies.
Full story BBC 14 Nov 2005.