Claims provisional winner Tshisekedi has done deal with former ruler may be more than sour grapes.
Sexual attacks, murder and torture in southern Congo.
large numbers of Congolese had worked in informal mining operations.
The rate of new Ebola cases has more than doubled after rebels forced response efforts to be briefly suspended.
The symbolic act took place at a nature park on the outskirts of the capital, Kinshasa.
The attack, suspected to have been carried out the Ugandan group the Allied Democratic Forces (ADF), killed at least 18 people, including 14 civilians.
Victims describe one of the least known, but most violent terror groups in the world.
There is increased tension in the country, especially after the authorities barred two prominent opposition politicians from running.