Officials have confirmed that the U.S. military, despite vowing not to use depleted uranium weapons on the battlefield in Iraq and Syria, fired thousands of rounds of the munitions during two high-profile raids on oil trucks in Islamic State-controlled Syria in late 2015.

The air assaults mark the first confirmed use of this armament since the 2003 Iraq invasion, when it was used hundreds of thousands of times, setting off outrage among local communities, which alleged that its toxic material caused cancer and birth defects. Continue reading.