The US military has concluded that a rocket fired earlier this month at an Iraqi air base housing hundreds of US troops contained no mustard gas, as initially suspected.
Test results released Tuesday "determined there were no chemical warfare agents present in the munitions fired toward the Qayyarah-West Airfield, Iraq, Sept 20, 2016," according to the US military command in Baghdad.
No one was injured in the rocket attack and no one showed any immediate signs of exposure to the suspected mustard agent.
But a field test of residue from fragments recovered from an impact site had indicated the possible presence of mustard gas.