San Bernardino County authorities have released the names of the 14 people shot and killed during a health department party.
The signed witnesses are Farook's brother and his brother-in-law, who spoke to reporters and expressed the family's shock and sadness hours after Wednesday's shooting.
California Gov. Jerry Brown is delaying his trip to the international climate conference in Paris to visit San Bernardino, where 14 people were killed at a social service center.
Brown's office says law enforcement officials will brief him Thursday afternoon on the investigation into the attack.
The Democratic governor was scheduled to attend at least 21 events over a six-day period at the U.N. conference on climate change.
Syed Rizwan Farook and his wife, Tashfeen Malik, opened fire on a holiday banquet of Farook's co-workers and then died in a shootout with police Wednesday.
A U.S. official says the FBI was treating the mass shooting in California as a potential act of terror but had reached no conclusion it was.
[...] the official said the contact was with "people who weren't significant players on our radar," dated back some time, and there was no immediate indication of any "surge" in communication ahead of the shooting.
The official said the communication was a "potential factor" but cautioned that "contact with individuals who are subjects of investigations in and of itself doesn't mean that you are a terrorist."
To get the visa, she had to submit to an in-person interview and biometric and background checks to ensure she wasn't a threat to public safety or national security.
A U.S. intelligence official says one of the shooters who killed 14 people in California had been in touch on social media with extremists who are under FBI scrutiny.
The official says investigators are still trying to determine whether and how he became radicalized and whether he was in contact with any foreign terrorist organization.
Rep. Adam Schiff, the top Democrat on the House Intelligence Community, says it's premature to conclude that one of the California attackers was self-radicalized or "moved by some international actor."
A friend says a man who was killed in the rampage at a Southern California social service center worked with one of the shooters and they had a heated conversation about Islam two weeks before the attack.
Authorities say the woman who helped her husband kill 14 people a banquet at a social service center in Southern California had a Pakistani passport and came to the U.S. on a fiancee visa.
David Bowdich, assistant director of the FBI's Los Angeles office, says Syed Farook, a U.S. citizen, traveled internationally and entered the U.S. with Tashfeen Malik in July 2014.
San Bernardino Police Chief Jarrod Burguan said at a news conference Thursday that the shooters had more than 3,000 rounds of ammunition at their home, 12 pipe bombs and hundreds of tools that could be used to make improvised explosive devices.
Burguan says Syed Farook and his wife sprayed the room at a social service center in San Bernardino with bullets but police didn't know if any one person was targeted.
Police say they found 12 pipe bomb devices at a California home being searched in connection with a mass shooting as well as hundreds of tools that could be used to make improvised explosive devices.
San Bernardino Police Chief Jarrod Burguan said at a news conference Thursday that the attackers also left a device at the social service center where they opened fire.
President Barack Obama is ordering U.S. flags to be flown at half-staff to honor the victims of the shooting in California that left 14 people dead.
Divorce papers from the parents of one of the San Bernardino, California, attackers reveal an acrimonious split in which the wife accused her husband of being an abusive alcoholic.
President Barack Obama says it's possible the mass shooting in California was related to terrorism but that authorities still don't know.
Authorities say Syed Rizwan Farook and his wife or fiancee, Tashfeen Malik, killed 14 people in a precision attack Wednesday at a social service center before they died in a gunbattle with police.
The home is where officers initially saw a vehicle matching the description of the suspects' SUV in the hours before the final gun battle that killed them.
Meredith Davis of the Bureau of Alcohol, Tobacco, Firearms & Explosives says investigators are now working to make a connection to the last legal purchaser.
