A new report has claimed that terrorist group Islamic State (IS) is using weapons and ammunition manufactured in 21 different countries, including China, Russia and the US.
London-based Conflict Armament Research has identified the origins of cartridges manufactured for machine and submachine guns, rifles, and pistols in a European Union financed-report.
More than 1,700 cartridges used by the group were collected during last July and August in northern Iraq and Syria. One cartridge was found to be of Soviet origin, and dated back to the 1940s.
The report claims that Russia and the former Soviet Union produced a total of 492 of the recovered shells, followed by China and the US, who supplied 445 and 323 of the cartridges respectively.
Some of the US cartridges were manufactured at an army munitions factory in Missouri.
According to the report, Bulgaria and China supplied more than half of the 170 cartridges that were discovered to have been produced between 2010 and 2014.
In September, US Congress passed a new law requiring the US Department of Defense (DoD) and State Department to monitor where weapons end up to minimise their misuse.
Last week, a series of terror attacks in Paris left 129 dead and hundreds more injured.
The US has vowed to redouble efforts by using military, diplomatic, law enforcement, and economic power against the Islamic State of Iraq and the Levant.