Mustard Gas

ISIS uses mustard agent in Iraq

American officials say ISIS fired a shell containing mustard agent that landed at a based used by Amercan and Iraqi troops.

UN investigation finds Syrian President's forces carried out at least two chemical attacks, and ISIS jihadists used mustard gas as a weapon.

Syrian media says ISIS terrorists attacked Syrian army troops with mustard gas in an offensive against a military airport.

CIA director John Brennan warns that ISIS has the capability to make small quantities of chlorine and mustard gas.

UN chemical weapons watchdog confirms mustard gas was used in Syria in August, and also reports yet another chlorine attack.

OPCW source says it has been concluded that mustard gas was used during fighting in Syria, but can't say who used it.

The US intelligence community is convinced ISIS has manufactured, or found, mustard gas - and moved on to chemical warfare.

Doctors Without Borders reports treating four patients in Syria who showed symptoms of exposure to chemical agents.

Senior American military official confirms preliminary tests show traces of sulfur mustard on mortars fired by ISIS.

Organization for the Prohibition of Chemical Weapons voices serious concern over reports that ISIS used chemical weapons.

Officials say test results from ISIS attack in Syria confirm mustard agent was used. Similar attack in Iraq still under investigation.

Senior American officials say it is believed ISIS jihadists used mustard agent in an attack on Kurdish forces in Iraq.