The couple behind the San Bernardino attack that killed 14 people were radicalised before they started dating, the director of the FBI has said.
James Comey said Tashfeen Malik and husband Syed Farook spoke of jihad and martyrdom during conversations on an online dating service in late 2013.
The FBI believes the duo were inspired by foreign terrorist organisations, but said the investigation is ongoing.
Last week's massacre was the deadliest terrorist attack in the US since 9/11.
The couple were both killed in a shoot-out with police hours after the attack.
Speaking during a Senate hearing in Washington, Mr Comey characterised the couple as "homegrown violent extremists", and said that precise nature of the foreign influence is still under investigation.