Collapsed homes bury residents while heavy flooding inundates parts of capital, Kinshasa, a city of some 15 million people.
Refugees call on UN, African Union to stop atrocities committed by armed groups in eastern Democratic Republic of the Congo.
Democratic Republic of Congo and Burundi troops conducted an anti-insurgent operation in Congo's eastern region and "neutralised" about 40 Burundian rebels.
Congolese officials say the identity of the dead man who crossed the border was not known, but that no Congolese soldier on duty in the area had been reported missing.
The stampede occurred during an overcrowded concert by African music star Fally Ipupa at the biggest stadium in capital Kinshasa.
Clashes between government forces and M23 rebels resumed last Thursday in the Rutshuru territory, sending at least 11,000 people to seek refuge in neighboring Uganda.
"The victims  were women and men, cut up with machetes. Some bodies were decapitated, others were found tied up," a local civil society leader tells of the killings in Masome village of Ituri province.
The highest number of cases and fatalities were reported in the Lusambo health zone, with 308 cases and 24 deaths.
Attacks by militias across eastern Democratic Republic of the Congo leave over a dozen people dead since Friday, including six miners who were decapitated by CODECO group rebels, officials say.
A joint investigation will establish responsibility for the incident that left at least two people dead and 15 injured and impose severe sanctions against the peacekeepers involved.
The children lost contact following fierce fighting in Rutshuru territory between the Armed Forces of the Democratic Republic of the Congo (FARDC) and M23 rebels.
Congolese M23 rebels have seized the town of Bunagana in North Kivu province as heavy clashes continue to drive hundreds of people across the border into Uganda.
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