Swiss humanitarian relief expert Philippe Lazzarini replaces another Swiss national, Pierre Krahenbuhl, who was forced to resign in November 2019 amid accusations of mismanagement.
Return of Houthi prisoners to capital, Sanaa, comes two days after the Saudi-led military coalition announced freeing 200 Houthis, a decision the UN hailed.
Earlier, the rebels announced they would release 350 prisoners, including three Saudi Arabians, under UN's supervision as part of peace initiative.
The president of the International Committee of the Red Cross says "over a million people live in misery, held hostage to a profoundly unsettling contradiction." Peter Maurer was speaking after visiting Rohingya refugees in Myanmar and Bangladesh.
The Syrian American Medical Society (SAMS) said four patients have been taken to hospitals in Damascus, the first of 29 critical cases approved for medical evacuation, and that the remainder would be evacuated over the coming days.
Daesh fighters are moving house to house through holes knocked in inner walls to avoid air surveillance. It is a battle that is being fought street by street as Iraqi forces attempt to retake Mosul.
The disease is suspected to have left some 8,500 people ill in over two weeks as hospitals struggle to cope with an influx of patients, the Red Cross says.
The world only has a "window of three to four months" to save millions in the two countries, according to the humanitarian organisation.
ICRC puts its aid operations across Afghanistan "on hold" after the attack. The ICRC employees were slain while they were carrying supplies to avalanche-hit areas in the north of Afghanistan.
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