The U.N.'s Yemen envoy returned to the capital Sanaa on Wednesday for fresh talks with rebels, as the government threatens to resume its offensive on a key port city if mediation fails.

U.N. envoy Martin Griffiths has been pushing for weeks to relaunch negotiations between Yemen's internationally recognized government and Iran-backed Houthi rebels.

The Red Sea port has been controlled by the rebels since 2014, when they drove the government out of the capital Sanaa and much of the country.

Nearly 10,000 people have been killed in the Yemen conflict since the 2015 intervention, 2,200 of them children.

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