According to recent reports, militants allied with al Qaida have trained women with a Western appearance as suicide bombers.
The women, who may have a "non Arab" appearance and be travelling on Western passports, have been prepared for their missions by the Yemeni group responsible for the operation to blow up an airliner over the United States on Christmas Day.
At this point, I have to wonder if a goal of militants is to provoke the West into instituting regular body cavity searches at airports.