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 (CNN) -- The San Bernardino, California, mass shooting is now being investigated as "an act of terrorism," FBI official David Bowdich said Friday. FBI Director James Comey said they uncovered "indications of radicalization" and possible "inspiration by foreign terrorist organizations." "As of today, based on the information and the facts as we know them, we are now investigating these horrific acts as an act of terrorism," said Bowdich, assistant director of the FBI office in Los Angeles. "There is nothing in our holdings about these two killers," he said. She posted a pledge of allegiance to ISIS leader Abu Bakr al-Baghdadi on Facebook while the shooting was happening, three U.S. officials familiar with the investigation told CNN. But Malik entered the U.S. on a K-1 visa, which is required of a fiance engaged to a U.S. citizen.  WASHINGTON — On the day she and her husband killed 14 people and wounded 21 others in San Bernardino, Calif., a woman pledged allegiance to the Islamic State in a Facebook post, officials said Friday, as the F.B.I. The woman, Tashfeen Malik, declared allegiance to the Islamic State on Facebook at roughly the time of the shooting on Wednesday, a Facebook spokesman said. Farook, 28, and Malik, 27, were killed in a shootout with police a few miles away — and more than four hours — after the bloodbath in San Bernardino. "This is looking more and more like self-radicalization," a law enforcement official said. But it's not known what connections Malik, who was born and raised in Pakistan and moved to Saudi Arabia about the age of 19, had with any terrorists or groups. A federal official said Farook has "overseas communications and associations," but it's not yet clear how relevant they are to the shootings. "I don't know the answer," Bowdich said, when asked whether the Pakistan-born Malik, who spent most of her childhood in Saudi Arabia, radicalized her husband. "We did not have her under investigation." The two shooters -- Syed Rizwan Farook and his wife, Tashfeen Malik -- were fatally shot in a gun battle with police hours after the initial incident. Farook, who is from Chicago and worked for five years as a San Bernardino County health inspector, met his future wife online and married her in 2013 while on a pilgrimage to Mecca, relatives said. Bowdich also could not explain why the couple suddenly stopped shooting after they had gunned down 14 people and wounded 21 more in the city's Inland Regional Center. Reporters go inside attackers home 
 
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 Even those who knew Farook best didn't see anything to suggest something nefarious, according to family representatives. That included Farook's mother, who thought nothing of it when the pair had her watch their 6-month-old girl while they went to a doctor's appointment, Abuershaid said. The FBI always leaves behind such lists after a search.
– Authorities say the woman who took part in this week's mass shooting in San Bernardino had pledged allegiance to the Islamic State online. The details of what Tashfeen Malik wrote and when she wrote it are still developing, but NBC News quotes a source as saying that she posted a statement in support of ISIS leader Abu Bakr al-Baghdadi "just before the attack." CNN has it a little differently, reporting that she pledged allegiance to Baghdadi "as the San Bernardino attack was happening" and that she did so under an account not bearing her name. In any event, authorities at this point don't think she and husband Syed Rizwan Farook were given any instructions prior to the attack by ISIS, reports the New York Times. "At this point, we believe they were more self-radicalized and inspired by the group than actually told to do the shooting," a federal law enforcement official tells the newspaper. The Times adds that the couple appeared to delete their "electronic information" in the days prior to the assault, firming up speculation that it was premeditated. (Just before the rampage, one co-worker asked, "Where's Syed?")