It seems the only evidence is that the US sent a carrier and task force.
Spain withdraw its warship from the group. All else is not clear.
British General Contradicts U.S. Claim of increased threat from Iran backed militias.
The sabotage on the tankers could have been done by anyone, literally. Of course one might think about Iran, or rather Yemen. The latter is at war with Saudi Arabia, and Iran has been said to support Yemen.
Or it's all a cover up and the next we hear is that Iran has weapons of mass destruction.