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As chilling details emerged about the Muslim couple who unleashed carnage Wednesday morning in Southern California, storming a social services office in tactical gear and assault rifles, killing 14 at an office gathering before dying hours later in a shootout with police, speculation mounted that the pair left their "IED factory" home hell-bent on jihad.

Syed Rizwan Farook, a U.S.-born citizen of Pakistani descent who had recently traveled to Saudi Arabia and begun wearing a full beard, and Tashfeen Malik, 27, burst into the San Bernardino facility and shot up a conference room where Farook's employer, the county health department, was hosting a holiday party. The pair escaped in a black SUV after the attack, which authorities said was over within minutes, only to resurface three hours later and less than 2 miles away in a fierce gun battle on the city's main drag.

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