The top American admiral in the Middle East said on Monday that Iran continues to smuggle illicit weapons and technology into Yemen, stoking the civil strife there and enabling Iranian-backed rebels to fire missiles into neighboring Saudi Arabia that are more precise and far-reaching.

Iran has been repeatedly accused of providing arms helping to fuel one side of the war in Yemen, in which rebels from the country’s north, the Houthis, ousted the government from the capital of Sana in 2014.

The officer, Vice Adm. Kevin M. Donegan, said that Iran is sustaining the Houthis with an increasingly potent arsenal of anti-ship and ballistic missiles, deadly sea mines and even explosive boats that have attacked allied ships in the Red Sea or Saudi territory across Yemen’s northern border. The United States, the Yemeni government and their allies in the region have retaliated with strikes of their own and recaptured some Houthi-held coastal areas to help blunt threats to international shipping, but the peril persists, the admiral said.