LOS ANGELES - A Pakistani woman's role as shooter in the San Bernardino massacre is raising fears that foreign-born brides could marry Americans as part of extremist missions.

Experts in jihad, immigration lawyers and former U.S. diplomats say there's no sign other foreign brides have sought Western marriages to launch attacks. And it's still not clear if 29-year-old Tashfeen Malik did so. But, they warn, that could change, especially if IS militants begin actively encouraging women to join men in attacks in the West.

The IS group currently bars women from taking up arms for combat or other attacks. But security expert say its commanders are pragmatic and adaptable and could drop their ban anytime.