Law enforcement personnel continue to investigate on San Bernardino Avenue, where two suspects in the mass shooting at the Inland Regional Center died in a shootout with police in San Bernardino, Calif. on Dec. 3, 2015.
Irfan Khan—LA Times/Getty Images
December 4, 2015 7:47 AM EST

ISLAMABAD, Pakistan — Pakistani authorities are working with American officials to uncover details about the mother suspected of carrying out the San Bernardino shooting with her husband, sources told NBC News.

Little is known about 26-year-old Pakistani national Tashfeen Malik, other than she was able to enter the U.S. on a fiancée visa, also known as a K-1 visa, allowing foreigners to travel to the U.S. for a wedding within 90 days.

Malik married 28-year-old Chicago-born husband Syed Rizwan Farook two years ago in Saudi Arabia after the pair met online, according to a family member and a friend.

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