Police in the US have released the names of the 14 people killed in a mass shooting in California. The victims were aged from 26 to 60 years old.
But they still don't know what motivated husband and wife Syed Farook and Tashfeen Malik to carry out the attack on Wednesday.
Our US correspondent Kate Fisher reports
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Just what is it that drove Syed Farook and his wife to leave their 6 month old baby before opening fire on a room full of his colleagues, celebrating at a Christmas party?
The couple were killed in a shootout with police some hours later. But officers say there could easily have been more attacks. They found more than 1600 bullets in their car. A search of their house revealed an arsenal of weaponry.
San Bernadino police chief, Jarrod Burguan said the attack must have been planned
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What motivated the attack is still unknown. President Obama says all possibilities are being explored - including terrorism and a work-place grudge
"Our expectation is is that this may take some time before we're able to sort it all through. There may be mixed motives involved in this which makes the investigation more complicated. But rest assured that we will get to the bottom of this."
To that end the FBI has taken over the investigation from local police. They're looking at whether Farook could have been in contact with known extremists. Kate Fisher, Washington