Top US official says Yemen's Huthi rebels 'threat' to navigation

US National Security Advisor Jake Sullivan said Friday Yemen's Huthi rebels are a "threat to freedom of navigation to commercial shipping", after the Iran-backed group claimed a series of attacks.

"The United States is working with the international community, with partners from the region and from all over the world to deal with this threat," Sullivan told journalists during a visit to Israel. "While the Huthis are pulling the trigger, so to speak, they're being handed the gun by Iran," he added.