Human Rights activists in the Democratic Republic of Congo say two people have been killed and more than 40 injured, some with gunshot wounds, after police clashed with opposition supporters in the city of Lubumbashi.

Police deny anyone was killed and say two people were injured.

Martin Fayulu, one of the candidates in this month's presidential election was campaigning in Lubumbashi - in the south-east of the country - on Tuesday when the police used water cannon and opened fire.

On Monday, he called off a rally in Kindu in eastern Congo after clashes broke out between his supporters and those of the ruling coalition candidate, Emmanuel Ramazani Shadary.