Violence in the highly-unstable country has not let up despite the resignation last week of strongman Michel Djotodia under intense regional pressure, and at least seven more people were killed in the capital overnight.
The violence "has all the elements that we have seen elsewhere in places like Rwanda, Bosnia. The elements are there for a genocide, there is no question about that," UN humanitarian operations director John Ging told reporters in Geneva after a five-day visit to the country.
fear is consuming the minds of an entire population, wherever you might go," Ging said.
AFP reporters today saw the bodies of three people, including a teenage boy, killed by bullets in a city mosque, while the country's Red Cross office said it had collected the corpses of four men killed by machete.
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Tension ran high in northern Bangui, where French troops patrolled in a bid to quell the unrest that spiralled between Muslim former rebels and the Christian majority in the wake of a coup that last year plunged the poor, landlocked country into chaos.
The French army acknowledged that there had been a clash but denied any link with the deaths.
"At the end of yesterday afternoon we were challenged by unidentified armed elements. We fired back but there is no confirmation of the toll. The three dead have nothing to do with the clash," a military source said.
Panicked Muslim residents were fleeing, headed northwards for neighbouring Chad, a country unfamiliar to many of them. AFP journalists saw dozens of people packed into lorries accompanied by Chadian troops from a regional African force named MISCA.
"We're being massacred here. I've suffered too much. I'm going," said Sadou Gambo, a widow with six children and no relatives in Chad.