A UN envoy has warned that Burundi is not ready to hold credible elections, reports AFP news agency.
Michel Kafando told the UN Security Council that the ruling party and its allies remain firmly in control of political life and tensions remain high, AFP adds.
"Only the majority party and some other allied political groups are able to conduct unobstructed political activities," said Kafando.
"Such a situation cannot be suitable for the organization of credible elections," he said.
In 2015 Burundi was plunged into crisis when Pierre Nkurunziza's successful bid for re-election to a third term sparked protests by opposition supporters who said the move was unconstitutional.