Guns supplied by Iran to its Houthi allies in Yemen are being smuggled across the Gulf of Aden to Somalia, where al Qaeda-linked al-Shabab insurgents are battling a weak and divided government, according to a Geneva-based think tank.
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The Global Initiative Against Transnational Organized Crime said its study drew on data from more than 400 weapons documented in 13 locations across Somalia over eight months and inventories from 13 dhows, or traditional sailing vessels, intercepted by naval vessels.
It is the first publicly available research into the scale of illicit arms smuggling from Yemen into the Horn of Africa country.
"Weapons originating in the Iran–Yemen arms trade are being trafficked onward into Somalia itself," the authors of the study said.
"Iran has repeatedly denied any involvement in the trafficking of arms to the Houthis. However, a preponderance of evidence points to Iranian state supply."
Iran's Foreign Ministry and a spokesman for Yemen's Houthi forces did not respond to a request for comment from Reuters on the study. Iran has repeatedly denied any involvement in the trafficking of arms to its Houthi allies in Yemen, where the six-year-old civil war has killed tens of thousands.
The Somali government spokesman and the internal security minister did not return calls or messages seeking comment.

The study said the investigators were not able to fully document the buyers and sellers of the weapons.
It said signs the weapons were originally supplied by the Iranian state included serial numbers that were very close together, indicating they were part of the same shipment, information from satellite navigation systems on seized dhows, and human intelligence from trafficking gangs.
One dhow carrying weapons that was seized by a US navy vessel had a GPS with stored points in Iran, southern Yemen, and Somalia, the report said, including a small anchorage near Jask port, which hosts an Iranian naval base, and "home" set as the Yemeni port of Mukalla, a well-known arms smuggling hub.
The guns end up with commercial smuggling networks whose customers can include armed factions seeking advantage ahead of Somalia's repeatedly delayed presidential elections, as well as clan militias and rival Islamist insurgent groups linked to al Qaeda and Islamic State, the study's authors said.
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