An archive picture of a damaged building in Sana'a, Yemen (Picture: PA).
The Saudi-led coalition fighting in Yemen said southern separatists have begun withdrawing from positions they seized from the government in the southern port city of Aden.
The Southern Transitional Council, backed by the United Arab Emirates, had wrested control of Aden on Saturday from forces loyal to the internationally-backed government after four days of fighting.
The fighting exposed a major rift in the coalition, which has been at war with Iran-aligned rebels since 2015.
Saudi state TV reported on Sunday that the separatists had heeded calls for an immediate ceasefire and begun withdrawing from all positions seized in recent days.
The coalition said it struck an area of Aden considered a "direct threat" to the government.
President Abed Rabbo Mansour Hadi and much of his government are based in Saudi Arabia.
The United Nations' humanitarian coordinator for Yemen said in a statement that as many as 40 people have been killed in Aden since 8 August.
260 others have been injured, said the UN humanitarian coordinator citing preliminary reports.