Iraqi forces say two other crude chlorine attacks have occurred since the extremists seized vast tracts of Iraqi territory this summer, but details on those incidents remain sketchy. The reported assaults all raise concerns that the militants are attempting to hone their chemical weapons capabilities as they push to control more ground.
The presence of a large former Iraqi chemical weapons production plant in territory seized by the Islamic State has compounded those fears, although officials and chemical weapons experts say the 2,500 degraded rockets filled with nerve agents that remain there are unlikely to be fit for use. Weapons inspectors sealed them off with concrete in a bunker more than 20 years ago.
The Islamic State’s reported chlorine attacks appear to have been largely ineffectual. The attack on the police officers last month is the only one officially documented.
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