The US military sighted an Iranian watercraft, known as Shark 33, in the Ras Isa marine dock near the port of Houthi-controlled Hodeidah, a US military source revealed in statements to CNN.
The source said that the sighted watercraft has an autopilot guidance system which has been modified so the boat can on autopilot identify the biggest object, lock onto it and attack targets without the need for a crew on board to launch the attack.
The watercraft was discovered days prior to the Houthi ballistic missile attack on Riyadh this past Tuesday.
US Ambassador to the United Nations Nikky Haley has referred to an Iranian boat of the same style during her presentation last week of remnants of Iranian weapons and missiles used by the Houthis against Saudi Arabia.
An expert was quoted by CNN as saying that the US Defense Intelligence Agency is already determined that the circuit boards were manufactured by an Iranian state sponsored electronics company.