Couple Kills 14 People, Injures 17 in California Mass Shooting [VIDEO]

san bernadino shooter syed FarookA couple who died in a hail of bullets after allegedly killing 14 people during a Christmas party at a state-run center for people with developmental disabilities left their six-month-old daughter with her grandmother before the onslaught.

U.S.-born Syed Rizwan Farook, 28, and wife Tashfeen Malik, 27, were killed in a shootout with police more than four hours after the rampage at the Inland Regional Center in San Bernardino, California, on Wednesday.

Farook had been at the party before the shooting and left “under some circumstances that were described as angry,” San Bernardino Police Chief Jarrod Burguan told reporters Wednesday night. Farook worked as a health inspector for the county health department for five years.

However, authorities would not rule out terrorism as a motive. Farook and Malik were wearing tactical gear and armed with assault-style rifles when they were killed, Burguan said, adding “there had to be some degree of planning.”

Authorities said an “explosive device” was found inside the building during a secondary sweep. Two of their four guns had been bought legally, sources told NBC News.