"The Iraqi Survey Group confirmed today that a 155-millimeter artillery round containing sarin nerve agent had been found," said Brig. Gen. Mark Kimmitt, the chief military spokesman in Iraq. "The round had been rigged as an IED (improvised explosive device) which was discovered by a U.S. force convoy."A detonation occurred before the IED could be rendered inoperable. This produced a very small dispersal of agent," he said.