As noted by Defense News:
The Houthi boat that attacked and hit a Saudi frigate Jan. 30 in the Red Sea, reported earlier as a suicide boat, was instead carried out by an unmanned, remote-controlled craft filled with explosives, the US Navy’s top officer in the Mideast said.
“Our assessment is that it was an unmanned, remote-controlled boat of some kind,” Vice Adm. Kevin Donegan, commander of the Bahrain-based US Fifth Fleet and head of US Naval Forces Central Command, told Defense News in an interview here Saturday.
The attack on the frigate Al Madinah appears to be the first confirmed use of the weapon which, Donegan said, represents a wider threat than that posed by suicide boats and shows foreign interests are aiding the Houthis.
Donegin is concerned “first that it is in the hands of someone like the Houthis. That’s not an easy thing to develop. There have been many terrorist groups that have tried to develop that, it’s not something that was just invented by the Houthis. There’s clearly support there coming from others, so that’s problematic.
“The second is the explosive boat piece — you don’t need suicide attackers to do a suicide-like attack. There are certain terrorists that do things and they get martyrs to go and do it. But there are many others that don’t want to martyr themselves in making attacks like that and that’s pretty much where the Houthis are. So it makes that kind of weaponry, which would normally take someone suicidal to use, now able to be used by someone who’s not going to martyr themselves.”
The unmanned boat was likely supplied by Iran, Donegan said.