(FOX NEWS) - Federal investigators believe there is a "very serious" possibility that Tashfeen Malik, one of two shooters who murdered 14 people and wounded 21 others in San Bernardino, Calif. Wednesday, radicalized her husband and co-assailant, county restaurant inspector Syed Farook, Fox News has learned.
Investigators also believe that the couple had planned a second attack after the shooting at a social service center for the disabled when they were killed in a shootout with local authorities approximately two miles away.
Little is known about Malik's background prior to her meeting Farook. However, a U.S. official confirmed to Fox News that the two met and became engaged after Farook traveled to Saudi Arabia in September 2013. Malik, a Pakistani citizen, applied for a K-1 visa at the American embassy in Islamabad in May 2014 and Farook traveled to Saudi Arabia that July to bring her to the U.S. The Saudi Embassy in Washington has confirmed that Farook's 2014 trip lasted nine days.
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