The United Nations is warning more than 120,000 people have fled fighting in the Yemeni city of Hodeidah, after U.S.-backed, Saudi-led forces began an assault on the strategic port city in early June. The warning came as the U.N. special envoy to Yemen, Martin Griffiths, said he’d made progress toward brokering a peace deal between the Saudi coalition and Houthi rebels. Griffiths made the comment after warring parties agreed to a 2-day pause in fighting around Hodeidah during his visit.

Martin Griffiths: “I look forward to working with all the parties, urgently, to find a solution both that will restore security and stability in Hodeidah, but also create positive conditions for a rapid and urgent restart of political negotiations in the coming days.”

The United Nations has called Yemen’s humanitarian crisis the worst in the world, with a cholera epidemic that’s affected more than 1 million people, and millions more on the brink of famine amid shortages of food, medicine and potable water.