U.S. special envoy Tim Lenderking is traveling to Oman and Saudi Arabia this week to support Yemen peace efforts, the U.S. State Department said on Monday in a statement that also urged an immediate end to attacks on Yemeni ports.

"At this critical moment, we remind the Houthis that Yemenis are calling for peace, not a return to war. To that end, we call on the Houthis to immediately cease their attacks on Yemeni ports, which are disrupting the flow of much-needed resources and exacerbating suffering across Yemen," the department said.

Lenderking, who previously visited the United Arab Emirates earlier this month over the United Nations-backed truce, left for the region on Sunday, it added.