The FBI said Friday it has taken the lead role in the investigation of the San Bernardino mass shootings, and that it would investigate the attack as an act of terrorism.
David Bowdich of the FBI's Los Angeles office told reporters Friday that investigators had uncovered "telephonic connections" between the two shooters and other subjects of the investigations. He said he did not know if the couple had been directed by a larger terror organization, but "we are looking very carefully into that."
Still, he cited a number of pieces of evidence that pushed the agency to officially declare a terrorism investigation.
With a young wife, infant daughter and government job, Syed Farook appeared to have arrived at a sweet-spot in life. Friends knew the 28-year-old by his quick smile, his devotion to his Muslim religion and earnest talk about cars he would restore.
They didn't know the man authorities say was busy with his wife, Tashfeen Malik, building homemade bombs and stockpiling thousands of rounds of ammunition for a commando-style assault Wednesday on a holiday party of his co-workers that killed 14 and injured 21.
Malik, for her part, had posted a statement of support for ISIS leader Abu Bakr al-Baghdadi online "just before the attack," a law enforcement official told NBC News.
A Facebook executive told The Associated Press that Malik posted the material under an alias account at 11 a.m. Wednesday. That was about the time the first 911 calls came in and when the couple were believed to have stormed into the San Bernardino social service center and opened fire.
The executive spoke on condition of anonymity because this person was not allowed under corporate policy to be quoted by name. The company discovered the Facebook account Thursday. It removed the profile from public view and reported its contents to law enforcement.
Despite this find, authorities looking into the shooters have found no evidence in the couple's house to suggest any substantive connection to a foreign terror organization, a U.S. government source told Reuters.
Bowdich said he was aware of the post, but declined to comment on it further. Authorities said they continue to look for the details of the killers' motive.