Updated

The U.N. chief's special adviser on genocide prevention is warning of a "high risk of crimes against humanity and of genocide" in the Central African Republic.

Adama Dieng and other U.N. officials briefed the Security Council on Wednesday on the continuing and unprecedented violence between Christians and Muslims in one of the world's poorest countries.

They spoke of children being beheaded and of entire villages burned, and they urged the deployment of more peacekeepers as soon as possible.

But they expressed hope at this week's election of an interim president who is the first female leader in the country's history, and at the $496 million in humanitarian assistance newly pledged by international donors.

An untold number of people have been killed since a March 2013 coup by Muslim rebels.