Thanks for posting that.
While "common sense" would seem to dictate that our enemies would forgo using such things as weapons (like the combatants of WWI learned about chemical warfare), we have to keep in mind that their deranged way of thinking brooks no respect or value for life at all. They regard all non-Islamists as subhumans that should be converted or slaughtered - the "innocent people" their American fronts mentioned in their supposedly anti-terrorist fatwa do not include non-believers.
In short, I wouldn't put it past them.