Islamic State propaganda is resonating with a growing and loyal following of young women and teenagers.
That's complicating U.S. counterterrorism efforts to identify and monitor supporters such as Tashfeen Malik - the 29-year-old mother suspected in the California shootings along with her husband.
It's unusual for a woman to be involved in mass violence in the United States. But the increasing number of women drawn to the Islamic State group is worrisome to American law enforcement and making it almost impossible to flag the prototypical recruit for investigation.
In the U.S., men by far account for the largest percentage of IS supporters. But authorities are concerned that the number of women supporting extremist ideology is on the rise.
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