"We estimate that more than 90% of conflict-attributable deaths through 2020, about 324,000, are of children younger than five," says UN Development Programme.
The Cameroon International Film Festival was cancelled in 2019 and 2020 due to the conflict between the Francophone government and Anglophone regions, as well as Covid-19.
The oil-rich African nation has become a key regional ally of the West in the fight against militants.
A spokesman for UN chief Antonio Guterres confirmed only that there was a "security incident", but gave no further details.
The accusation relates to an incident on January 10 that the Cameroon army, which is fighting armed separatists in the region, says was a fight with "terrorists."
A UN spokesman said the key cause of the deteriorating situation is the very high level of insecurity along the road link to Cameroon where over 1,600 trucks, with 500 carrying humanitarian supplies, remain blocked at the border since mid-December.
A local governor reports that 53 people are dead and 29 others injured in Dsang, central-western Cameroon, when a bus collided with a fuel van.
At least 37 people have died and 18 others are seriously injured after the accident in Cameroon’s western village of Nemale.
The suspected militants have thrown a grenade into a group of sleeping people inside the camp in the village of Nguetchewe.
An official said explosives that were fired from outside the city "landed on separate sites."
Fighters from Daesh West Africa Province drove into remote Felo village in Gubio district in the early afternoon, shooting fleeing residents and running them over with their vehicles.
The global coronavirus pandemic has affected more than five million people, with over 334,000 deaths. Here are coronavirus-related updates for May 22:
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