Seizures of Iranian Weapons at Sea

Between 2015 and 2021, the United States and its allies intercepted at least eight shipments of weapons allegedly originating from Iran and headed to Yemen. The vessels were either unflagged dhows, wooden boats or fishing vessels. Their cargoes varied in size, and the weapons varied in lethality. Some ships carried small arms, such as machine guns and AK-47 assault rifles. Others carried anti-tank and surface-to-air missiles or components for anti-ship and land attack cruise missiles. The shipments were likely intended for the Houthi rebels, a Zaydi Shiite militia group supported by Iran. The following is a rundown of seizures, beginning with the most recent:



December 20: The USS Tempest and USS Typhoon interdicted a stateless fishing vessel in the northern Arabian Sea with a cache of illicit weapons, including 1,400 AK-47 assault rifles and 226,600 rounds of ammunition. The ship was on a route historically used to illegally smuggle weapons to the Houthis in Yemen. “The smuggling of arms from Iran to the Houthis represents a flagrant violation of the UN targeted arms embargo and is yet another example of how malign Iranian activity is prolonging the war in Yemen,” State Department Spokesperson Ned Price said. U.S. Navy personnel removed the weapons and ammunition from the ship and planned to return the crew, including five Yemeni nationals, to Yemen. 

Thousands of illicit weapons laid out on the USS Monterey
Illicit weapons interdicted by the USS Monterey in May 2021

May 6 - 7: The USS Monterey interdicted an unflagged dhow in the northern Arabian Sea with a large cache of illicit weapons, including dozens of Russian anti-tank missiles, thousands of Chinese-made assault rifles, and hundreds of machine guns, sniper rifles and rocket-propelled grenades. Navy photos showed the weaponry laid out on the deck of the Monterey. The source and destination of the weapons were “under investigation,” U.S. Fifth Fleet based in Bahrain said in a statement. U.S. naval and coast guard personnel removed the cargo from the dhow and questioned the crew before releasing them.



Surface-to-air missiles seized on al Qanas-1 in February 2020
Surface-to-air missiles seized by the U.S. Navy in February 2020

June 28: The U.S. Navy and partner forces interdicted a boat off the coast of Yemen. The vessel was carrying “200 RPGs, more than 1,700 AK rifles, 21 surface-to-air and land-attack missiles, several anti-tank missiles, and other advanced weapons and missiles,” Secretary of State Mike Pompeo told reporters on July 8, 2020. “Iran is not abiding by the U.N. arms embargo restrictions that are due to expire in less than four months now.”

Feb. 9: The USS Normandy interdicted the Al Qanas 1, an unflagged dhow in the Arabian Sea manned by Yemeni nationals. The vessel was carrying 150 anti-tank missiles, three surface-to-air missiles, night vision scopes and drone components, the Justice Department reported. U.S. naval personnel interrogated the dhow’s crew before handing them over to the Yemeni Coast Guard. The weapons were “destined for the Houthi rebels,” according to the Pentagon. “There’s not a plausible explanation for how these weapons got on the dhow without the sanction of the Iranian government,” said Captain Bill Urban, the CENTCOM spokesperson. The Justice Department later connected the Al Qanas 1 to the Qods Force. A U.N. panel of experts also concluded that the anti-tank missiles were most likely "manufactured in the Islamic Republic of Iran."



Nov. 25: The USS Forrest Sherman interdicted the Al Raheeb, an unflagged wooden dhow crewed by Yemeni nationals in the northern Arabia Sea. The boat was carrying 21 anti-tank missiles, five surface-to-air missiles, components for land-attack and anti-ship cruise missiles, thermal optical sights, blasting caps and drone components, according to a Justice Department filing. The missiles were “the most sophisticated weapons seized by the U.S. Navy to date during the Yemen conflict,” U.S. Special Representative for Iran Brian Hook said on December 5, 2019. The Justice Department later connected the Al Raheeb to the Qods Force. A U.N. panel of experts concluded that the Al Raheeb carried “Iranian” anti-tank missiles.

Missile and drone components discovered on the al Raheeb
Missile and drone components discovered on an unflagged wooden dhow in November 2019


Rifles seized by the USS Sirocco
AK-47 rifles seized by the USS Sirocco in March 2016

Mar. 28: The USS Sirocco interdicted a dhow in the Arabian Sea headed for Yemen. The vessel was carrying “1,500 AK-47s, 200 RPG launchers and 21 .50 caliber machine guns,” the U.S. Navy said in a statement. The weapons were taken into U.S. custody, while the crew were permitted to depart. The U.S. Navy said that the weapons “originated in Iran” and were “likely bound for Houthi insurgents in Yemen.”

Mar. 20: The FS Provence, a French destroyer, interdicted a dhow in the northern Indian Ocean. The dhow was carrying “several hundred AK47 assault rifles, machine guns and anti-tank weapons,” according to the Combined Maritime Forces (CMF), a U.S.-led coalition of 34 nations that operates in the Rea Sea, Gulf of Aden and Gulf of Oman. The taskforce initially said that the weapons were destined for Somalia, but the U.S. Navy later assessed that the weapons originated from Iran and were destined for Yemen.

Feb. 28: The HMAS Darwin, an Australian warship, interdicted an unflagged fishing vessel more than 170 miles off the coast of Oman. The crew “searched the vessel and discovered 1989 AK-47 assault rifles, 100 rocket propelled grenade launchers, 49 PKM general purpose machine guns, 39 PKM spare barrels and 20 60mm mortar tubes,” the CMF reported. A CMF taskforce initially said that the fishing vessel was headed toward Somalia, but the U.S. Navy later assessed that the weapons originated from Iran and destined for Yemen.

A dhow seized by HMAS Darwin carried nearly 2,000 AK-47 rifles
The HMAS Darwin seized this dhow carrying rifles, machine guns and RPG launchers in February 2016



Sept. 30: The Saudi-led coalition in Yemen interdicted an Iranian fishing boat in the Arabian Sea about 150 miles off the coast of Oman. The vessel was carrying 18 anti-tank missiles, 54 anti-tank shells, 15 shell battery kits, four firing guidance systems and five binocular batteries “destined to the Houthi militias” in Yemen, the coalition reported. The Iranian crew claimed that the vessel was bound for Somalia. 


Andrew Hanna, a program specialist at the U.S. Institute of Peace, compiled this report.


Photo credits: USS Monterey via U.S. Navy (public domain); USS Siroccco via U.S. Navy (public domain); FS Provence via CMF (public domain); Dhow seized by HMAS Darwin via CMF (public domain); Missile and drone component cache via Justice Department (public domain); Surface to air missiles via Justice Department (public domain).