officials later confirmed that samples taken from the site of the attack had tested positive for a small amount of mustard agent
, in low concentration.
Encompassing 23,000 acres, PCD is responsible for storing 2,600 tons of mustard agent
in approximately 780,000 munitions.
forces had detected a sulfur mustard agent
on fragments of a shell that ISIS had fired against Kurdish forces earlier this month.
They have frequently used chlorine and mustard agent
against the Kurds and Iraqi security forces around Mosul over the last year and chemical weapons are likely to play a role in their defence of the city.
Medical Management Guidelines for Blister Agents such as Sulfur Mustard Agent
H or HD (C4H8Cl2S), Sulfur Mustard Agent
The shell initially tested positive for a mustard agent
, but two subsequent tests have been inconclusive and the device is undergoing further tests, Navy Captain Davis told reporters.
A group of US forces inspected the fragments afterwards and took a small sample of a suspicious "tar-like, black, oily" substance, which initially tested positive for mustard agent
but then tested negative in a subsequent examination, the official said.
The IS has fired a small rocket at a military base that hosts hundreds of US troops near Mosul, with the shell testing positive "for a mustard agent
Following reports of a possible mustard agent
attack on US troops south of Mosul on Tuesday and confirmed chemical weapons attacks on Kurdish forces in the past, there are also concerns that IS might resort to such tactics in its defence of the city.
When Libya joined the Chemical Weapons Convention in 2004, the Gaddafi government declared a host of material it held in its chemical arsenal, including a vast store of bulk sulphur mustard agent
The jihadist group fired rockets suspected of carrying a mustard agent
last month from Bashir on Taza Khurmatu, another town in the northern province of Kirkuk.
Army began destroying the nation's largest remaining stockpile of chemical weapons Wednesday, using explosives to rip open a container of mustard agent
inside a sealed chamber and then flooding it with another chemical to neutralize it.