Mentally retarded women used in bombings

Reports are the suicide bombers today in Iraq were retarded women and the bombs were set off remotely by cell phone.

Multiple news reports appear to confirm that the women were indeed retarded, which if true would certainly mark a stomach-burning absence of morality. But how could authorities possibly know the bombs were detonated remotely?

Any suicide or car bombing by any side for any reason is despicable because it deliberately targets non-combatants. I’m just wondering if the facts as reported here are accurate or not.