The U.S. Navy said it has seized an arms shipment hidden aboard a vessel in the Arabian Sea.
The U.S. Navy has previously seized weapons in the Arabian Sea believed to be from Iran and intended for Huthi rebels in Yemen.
In a statement on May 9, the U.S. Navy said the source and intended destination of the weapons was under investigation.
"The cache of weapons included dozens of advanced Russian-made anti-tank guided missiles, thousands of Chinese Type 56 assault rifles, and hundreds of PKM machine guns, sniper rifles, and rocket-propelled grenades launchers," the statement added.
It said the weapons were seized aboard a stateless dhow sailing vessel during a maritime interdiction operation on May 6-7.
Yemen is overflowing with small arms that have been smuggled into poorly controlled ports since the country was plunged into a grinding civil war in 2015.
The conflict pits the Iranian-backed Huthis, who control the capital Sana’a and much of the north and west, against the Saudi-backed government and southern secessionists, which are also locked in competition for power.