The head of the CENI said the candidates were involved in illegal activities which include fraud, illegal possession of voting material and intimidation.
Congolese voted starting December 20 in concurrent presidential, parliamentary, and local polls.
In a statement released, main opposition candidates in the presidential election asked how, in a simultaneous election with a single ballot paper, fraud could not have affected the entire general election.
This is after CENI had announced the re-election of incumbent president Felix Tshisekedi.
The powerful group of Christian churches has demanded an independent inquiry be opened into irregularities and alleged legal violations observed during December general elections.
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