The United Nations is trying to evacuate at least 140 aid workers from the Yemeni capital amid fighting that has cut off the airport road but it awaits approval from the Saudi-led coalition, UN and other aid officials said on Sunday.
Coalition aircraft bombed Houthi positions in Sanaa overnight, residents and local media said, aiming to shore up supporters of former Yemeni president Ali Abdullah Saleh as they battle the Houthi group, which is aligned with Iran.
It was the fourth day of clashes in which dozens have been killed, the Red Cross said.
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"There is a plane on stand-by in Djibouti for 140 international staff," a U.N. official in Sanaa told Reuters. About half were from non-governmental organisations, he said.
"Fighting is moving towards the airport and the situation is very tense. We can't even evacuate staff," he said.
United Nations staff have been confined to their living quarters in Sanaa since clashes erupted on Thursday, he said.
Shells were falling near the UN compound in Sanaa on Siteen Street on Sunday, with one source on the scene saying stray bullets had hit the compound. The compound is empty as staff had been told to stay home and not report to work for days.
Another aid worker from an independent agency in Yemen, who declined to be identified, told Reuters: "The UN is planning a reduction of staff for UN agencies and some NGOs."
"But more importantly they consider that the road to the airport is not safe enough to organise a movement to the airport," he said, adding that it might involve evacuation of a total of 180 aid workers.
There was no immediate reply from the United Nations to Reuters queries seeking confirmation of the reports.
Clearance to land at Sanaa airport has yet to be received from the coalition, who control the skies over the Houthi-controlled capital, aid workers said.
Saleh said on Saturday he was ready to turn a "new page" in ties with the coalition fighting in Yemen if it stopped attacks on Yemeni citizens, in a move that could pave the way to end nearly three years of war.
The apparent shift in position came as Saleh's supporters battled Houthi fighters in Hadda, a district in southern Sanaa where members of Saleh's family, including his nephew Tareq, live.
Another UN source in Yemen said: "UN and NGO staff are not evacuating, but rather planning a reduction in the number of non-essential staff in Sanaa until the security situation on the ground is clearer."
In Geneva, spokeswoman Elodie Schindler of the International Committee of the Red Cross said: "In light of the current chaotic situaton, the ICRC is looking to downsize staff presence in Yemen to a core team".