A air strike by the Saudi-led coalition against a radio station in Yemen's Houthi-held port city of Hodeidah killed four people on Sunday, residents and medical sources said.
The UN's Yemen envoy Martin Griffiths has met the country's Houthi rebels in a push for new peace talks, as fighting continued around Hodeida.
The UN warned Friday that shelling and air strikes in Yemen's Hodeida province have targeted humanitarian workers and infrastructure, threatening its ability to feed 3.5 million "very hungry people."
Doctors and medics in two hospitals in Hodeida province said 50 people have been killed in the past 24 hours, seven of them pro-government fighters.
The US assessment comes after a string of high-profile coalition strikes that have killed scores of civilians, many of them children.
Clashes and air strikes have left 84 people dead around Yemen's Red Sea port city of Hodeida since the collapse of UN-brokered peace talks, hospital sources said Sunday.
The government representative said the delegation had decided to return home after the talks were put on hold for three days.
Multiple military sources reported the government alliance attempted on Friday to close in on rebel-held Hodeida.
Yemen's Houthi rebels, expected at UN-sponsored peace talks in Geneva with the government, remained grounded in Sanaa on Friday citing fears they would not be allowed to return to the capital.
The rebel delegation, still in Sanaa, insisted the UN meets three demands before it travels to Switzerland.