A mass shooting by a married couple that left 14 people dead in California is being investigated as an act of terrorism, the FBI says.
The pair had carried out "extensive planning", a spokesman said.
Tashfeen Malik, 27, and her husband Syed Rizwan Farook, 28, died in a shootout with police after the killings at San Bernardino, east of Los Angeles.
The FBI says it is also investigating reports that Malik had pledged allegiance to Islamic State (IS).
Malik is reported to have posted a message on Facebook in support of IS leader Abu Bakr al-Baghdadi under a different name. The post has since been removed.