The United States on Monday called on all sides in Yemen to re-energize political talks to end the country’s civil war, after former President Ali Abdullah Saleh was killed in a roadside attack.

A U.S. official, who spoke on condition of anonymity, told Reuters that Houthi rebel claims on Sunday they launched a missile at Abu Dhabi demonstrated “how destabilizing this war is for the region and how the Iranian regime is exploiting the war for its own political ambitions.”