Police in the Congolese capital Kinshasa says they have shot dead four people since disputed election results were released on Friday.
The opposition has refused to accept the official results, which have given a clear victory to president Joseph Kabila.
Sporadic gunfire continued to echo around Kinshasha and in the central Democratic Republic of Congo city of Mbuji-Mayi on Saturday.
The BBC is reporting that voting for the opposition was strong in both cities and many feel the election result was manipulated.
Angry residents of a Kinshasa suburb have accused the security forces of attacking them, killing young men and looting homes and shops.
National police chief General Charles Bisengimana says three of those shot dead by police were looters and the fourth was a woman hit by a stray bullet.