Guinea’s authorities have imposed a night curfew on Nzerekore after clashes broke out leaving one person dead.
Fighting broke out on Saturday after a campaign visit from President Alpha Conde, who is running for re-election.
Supporters of the president clashed with those of his rival Cellou Dalein Diallo in the hotly contested city.
Opposition parties have called for Sunday’s election to be postponed over alleged irregularities in the process.
Nzerekore is seen to be a stronghold of former military junta leader Moussa Dadis Camara, who recently attempted to return to Guinea from exile to run for president.
His party has now entered an alliance with Mr. Diallo.
Diallo won the first round in the 2010 election but lost in the run-off against Alpha Conde.
In addition to the one fatality, more than 80 people were wounded by gunshots or stones in the fighting.
President Conde is facing seven challengers in the second election since the death of the long-serving leader Lansana Conte.
