Amnesty International says most of the Islamic State group's weapons were taken from the Iraqi army.
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The international rights group says in a report released Tuesday that decades of reckless arms trading and poorly regulated arms flows into Iraq have contributed to ISIS' "large and lethal arsenal," which is being used to commit war crimes on a massive scale in Iraq and Syria.
Amnesty based its report on expert analysis of verified videos and images.
It says the weapons used by ISIS were manufactured and designed in more than two dozen countries, including Russia, China the U.S. and European states.