From this morning's Christian Science Monitor:
In the course of locating seven weapons caches in a single block around a mosque in northeast Fallujah, an Iraqi platoon Wednesday found a suitcase full of vials labeled "Sarin," a deadly nerve agent.
While further analysis determined that the find was probably part of a Soviet test kit with samples, its discovery in a room with mortar shells appeared to indicate an intent to weaponize the material.
As I noted a few days ago, the Marines went into the city with gas masks, specifically because of their concern about sarin. And then there's the reason why they may have been concerned. Buried in the NYT a few weeks ago:
Looters overran an Iraqi complex last year where a bunker holding old chemical weapons was sealed by United Nations monitors, American arms inspectors have reported. Iraq said 2,500 sarin-filled artillery rockets had been stored there.