Insecurity, health and education are among key issues that have dominated campaigns as the country gears up for the vote.

It is unclear whether the elections will take place in the restive east where dozens of armed groups are active.

The government is using aircraft from the Congolese army, Egyptian army and UN peacekeeping force Monusco to deploy the remaining election materials, government spokesperson Patrick Muyaya said on Sunday.

More than a dozen candidates, including incumbent President Felix Tshisekedi, Nobel laureate Denis Mukwege and prominent opposition leader Moïse Katumbi have been cleared to vie for the presidency.

Human Rights Watch has raised alarm over election-related violence ahead of the vote.

Two parliamentary candidates were killed by unknown gunmen on Sunday as they campaigned for votes.