Stephen O'Brien briefed the Security Council yesterday and repeated the call for an "unconditional freeze" in the months-long fighting between a Saudi-led coalition and Shiite Houthi rebels in the Arab world's poorest country.
A five-day humanitarian pause announced by the Saudi-led coalition quickly fell apart early Monday. An earlier pause announced this month by the UN also failed.
He said he will travel to Yemen in the coming weeks, and Yemen's UN ambassador said he welcomes the Aug. 9 visit.
O'Brien is expected to visit the southern port city of Aden, which the UN says has been devastated in the four months of fighting.
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The UN humanitarian coordinator for Yemen was only able to reach Aden this week for a brief visit after a 12-hour boat ride via Djibouti.
The Saudi-led coalition has been accused repeatedly of killing civilians in its airstrikes against the Houthis, but the country's UN ambassador, Abdallah Al-Mouallimi, tried to play down expressions of concern about "casualties here, casualties there."