Election-related violence in the Democratic Republic of Congo killed at least 18 civilians between November 26 and 28, Human Rights Watch said Friday, urging an end to killings by security forces.

"The government of the Democratic Republic of Congo should immediately rein in its security forces, especially the Republican Guard, and prevent the targeting of political opponents and their supporters in the aftermath of the November 28, 2011 presidential and legislative elections," the group said in a statement.

Police banned all political rallies in Kinshasa Saturday after a man died in a stoning on the final day of campaigning for the Democratic Republic of Congo's national elections.

"We have decided to ban all gatherings and meetings, there has been a death," said Kinshasa police chief Jean de Dieu Oleko at Kinshasa airport, where thousands gathered to meet President Joseph Kabila and opposition leader Etienne Tshisekedi, the main rivals in Monday's polls.