11 a.m. PT:
Authorities respond to reports of a multiple-victim shooting. Authorities later say attackers opened fire at the Inland Regional Center, a social services center that serves people with developmental disabilities, during a holiday gathering for San Bernardino County health department employees. The shooters fire with long guns, authorities say. People remain in place and hide in other parts of the building for the next two hours. Police report a dark-colored sports utility vehicle fled the scene.
12:25 p.m.: Police say they are searching for one or more gunmen. Authorities say multiple people have been shot.
1:05 p.m.: “There are multiple casualties and there are some confirmed fatalities,” San Bernardino Police Sgt. Vicki Cervantes says.
2 p.m.: At a press conference, San Bernardino Police Chief Jarrod Burguan says 14 people died and about 14 were hurt in the attack. Up to three people entered and opened fire, Burguan says. “They came in with a purpose,” he tells reporters. “They came in with the intent to do something.”
2:45 p.m.: President Obama says: “We have a pattern now of mass shootings in this country.” In an interview with an already scheduled interview with CBS, the president calls for “common-sense gun safety laws” and “stronger background checks.”
3:20 p.m.: Police point guns at a dark-colored S.U.V. and engage in a shootout. They report a suspect is down outside of the S.U.V. Police later say two suspects, a man and a woman in the vehicle, died in this shooting. They later say a third person has been detained but how this person might be connected to the shootings is not clear.
4:20 p.m.: California Gov. Jerry Brown says in a statement: “California will spare no effort in bringing these killers to justice.”
5:05 p.m.: Police execute a search warrant at a home in Redlands, Calif.
7:40 p.m.: Twitter crackles with word that law enforcement has identified Syed Farook as a suspect, and various news organizations, including USA TODAY, cite an unidentified law enforcement official as a source for confirmation.
10:10 p.m.: In a news conference, police identify the second shooter as Tashfeen Malik, wife of Syed Farook.
Jefferson Graham reports from San Bernardino, California, where survivors and family members at Wednesday’s mass shooting have been bussed to a local community center. Sean Fujiwara