The Central African Republic fell into crisis in 2012 after violence erupted from a mainly Muslim rebel insurgency known as the Seleka that sparked the creation of rival Christian militias known as the anti-Balaka.

The new talks, which started last week with senior CAR officials and rebel chiefs in the Sudanese capital Khartoum, came after seven previous rounds failed to reach a lasting agreement.

Talks have focussed since Monday on the demands of the 14 armed groups, notably the formation of a unity government and the amnesty proposal for warlords, national television TVCA reported.

CAR authorities have always rejected an amnesty for militia commanders, many of whom face UN sanctions or human rights accusations.

"After a detailed review of a draft peace proposal we realise that the fundamental and key points of our demands have not been taken into account," one anti-Balaka militia representative told AFP.

A representative of the FPRC, the country's largest armed group, said that as the talks currently stand, "we will be rejecting the deal and everyone will be going home."

At a news conference in the CAR capital Bangui on Wednesday, the UN mission in the country, MINUSCA, warned of a spike in "fake news on social networks".

MINUSCA spokesman Uwolowulakana Ikavi cited as an example a report that armed groups were calling for President Faustin-Archange Touadera's resignation.

Sudanese authorities say the talks in Khartoum could last up to three weeks.

CAR's crisis deepened in March 2013, after a power-sharing deal with the government collapsed, and the Seleka entered the capital Bangui to force president Francois Bozize, a Christian, from power.

Former colonial ruler France intervened militarily under a UN mandate, pushing the Seleka from power, and Touadera was elected in February 2016.

But his government controls only a fraction of the state, despite the support of more than 13,000 troops and police in the MINUSCA mission.

Most of CAR is in the hands of militias, who often portray themselves as defenders of their own religious group but fight turf wars over cattle or mineral wealth, including gold, uranium and diamonds.

Thousands of people have been killed and a quarter of the population of 4.5 million have fled their homes because of the violence.