The Jan 30 attack on a Saudi frigate in the Red Sea was carried out by a Houthi remote control ‘drone boat,’ and not a suicide bomber as first reports claimed, according to a senior U.S. Navy official.

What was originally reported as a suicide attack was revised following further analysis and assessment by the Navy. 5th Fleet Commander Vice Admiral Kevin Donegan told Defense News he believes that level of technological sophistication is beyond the capabilities of the Houthi rebels, currently engaged in a civil war in Yemen.

Instead, Donegan believes the attack to have originated with Iranian support.

The civil war in Yemen has been ongoing since 2014, and following the 2015 military intervention by a coalition of Arab states led by Saudi Arabia, has become a de facto proxy war between Iran and the Saudis, as each vies for regional influence.