The FBI has declared that the mass shooting at a San Bernardino government building is now being treated as an act of terrorism.
Officials are also looking at whether the female assailant Tashfeen Malik may have declared allegiance to the Islamic State group on Facebook at the time.
Wielding an assault rifle, she and her husband Syed Rizwan Farook killed 14 and injured 21.
FBI Assistant Director David Bowdich says they have several lines of evidence, including two crushed cellphones found in a trash can.
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FBI Assistant Director David Bowdich says they are pursuing contacts to the couple...
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FBI Assistant Director David Bowdich says they are following several leads...
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