A Saudi-led coalition battling rebels who hold Yemen’s capital began a unilateral cease-fire Wednesday in the yearslong war, even as the insurgents said they rejected the proposal.

The Saudi-proposed pause in fighting began at 6 a.m. ahead of the holy Muslim fasting month of Ramadan. Several similar efforts have failed, and there was no immediate independent confirmation on whether hostilities paused between Saudi-led forces and Yemen’s Houthi rebels.

The cease-fire announcement late Tuesday had raised immediate doubts because the Iran-backed rebels are skipping an ongoing summit over the war in Saudi Arabia, called by the Saudi-based Gulf Cooperation Council, because it’s taking place on their adversary’s territory.

Within hours, Houthi official Mohammed al-Bukaiti rejected the offer over the continuing closure of Sanaa’s airport and restrictions on the country’s ports by the Saudi-led coalition.