The United Nations Special Envoy for Yemen, Hans Grundberg, on Friday warned about escalating violence in Yemen.
"Yemen today faces a greater risk of renewed large-scale conflict than at any point since the UN-brokered truce of April 2022," he wrote on X.
He said recent attacks by Yemen's Iran-aligned Houthi militia in Ma'rib and Hadramawt had reportedly caused significant casualties, including civilians, while renewed attacks on commercial shipping in the Red Sea and Gulf of Aden had escalated tensions.
He was also concerned by strikes on civilian infrastructure, including airports, and heightened regional tensions.
"Taken together, these developments risk jeopardizing the gains of the 2022 truce, reflected in the relative calm that has held inside Yemen in recent years, while also drawing the country into a broader regional confrontation, with devastating consequences for its people."
Grundberg said he had "engaged intensively with the Yemeni parties, regional actors and international partners to explore concrete options" for de-escalation.
"I remain convinced that a diplomatic path remains available. It will require political will, difficult choices and genuine engagement from the parties."
The unofficial ceasefire has largely held in Yemen since 2022, but tensions between the Houthis and Saudi Arabia, which backs the internationally recognized Yemeni government, have escalated in recent weeks.
The country has been mired in conflict since the Houthis seized Sana'a and other parts of northern Yemen in late 2014.