Weapons Cache Explosion In Iraq

I just received a private e-mail from someone I know from a Marine website who has family in Iraq. There has been a weapons cache explosion that caused many, hundreds of people to be exposed to some chemical that was present in the weapons...

As of yet, chemical alarms are going off and many tests are being taken. I do not have much more detail. I am trying to find the symptoms involved and just what alarms are being set off.