Four men were charged on Thursday in connection with a vessel that was intercepted by the US Navy in January while allegedly transporting Iranian-made weapons, the US Justice Department said.

Two US Navy SEALs were reported missing after boarding the unflagged vessel in a Jan. 11 operation near the coast of Somalia. They were declared deceased 10 days later after an exhaustive search.

"Two Navy SEALs tragically lost their lives in the operation that thwarted the defendants charged today from allegedly smuggling Iranian-made weapons that the Houthis could have used to target American forces and threaten freedom of navigation and a vital artery for commerce," Deputy Attorney General Lisa Monaco said in announcing the charges.

The US has carried out a string of strikes against Houthi targets in Yemen in response to the group's attacks on merchant ships in the Red Sea that have disrupted global trade and raised fears of supply bottlenecks.

The Justice Department said the boat's captain, Muhammad Pahlawan, had been charged in a criminal complaint with transporting by ship explosives that he knew were intended to cause death or harm and with lying to the federal agents who boarded the vessel.

Mohammad Mazhar, Ghufran Ullah and Izhar Muhammad were each charged with lying to the federal agents. The four men were carrying Pakistani identification, prosecutors said in the criminal complaint.

A search of the boat following the raid turned up what are believed to be Iranian-made advanced weaponry, including components for medium-range ballistic missiles and anti-ship cruise missiles.