At least one person was killed in Uganda's capital Kampala on Monday in the worst outbreak of violence yet during campaigning for the forthcoming presidential election on February 18.
Police clashed with opposition supporters after briefly detaining a leading presidential candidate twice as he tried to hold campaign rallies three days before Thursday's vote.
ELECTION 2016: Young voices from Uganda
Police spokesman Fred Enanga confirmed on Tuesday that one civilian was killed in Monday's scuffles and that police fired rubber bullets to disperse supporters of presidential candidate Kizza Besigye.
Besigye, who has lost three disputed elections against long-running president Yoweri Museveni, said on Tuesday he did not believe the election would be free and fair.
Museveni is widely predicted to win a fifth term in power in Thursday's polls.
Uganda plays a key role in East Africa as a major regional economic and military power.