The warring parties in Libya are both reported to have pulled out of planned United Nations-sponsored negotiations.
The UN wanted to bring political representatives from the two sides together on Wednesday in Geneva.
But politicians based in eastern Libya – which is controlled by Gen Khalifa Haftar – said they would not take part because the UN had not approved all the members of their delegation.
Later their rivals – the authorities in the capital, Tripoli – said they would not participate in talks on political matters until progress was made in parallel discussions on military issues.
The UN says it hopes Wednesday’s gathering might still go ahead.