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The FBI said it is officially investigating Wednesday's mass shooting that killed at least 14 people in San Bernardino, Calif., as a terrorist act.

"We are now investigating these horrific acts as an act of terrorism," David Bowdich, assistant director of the FBI's Los Angeles office, announced during a news conference Friday. He said the shooters had attempted to erase their digital footprints and that agents had recovered two deliberately destroyed cellphones.

In a later press conference, FBI director James Comey said there was no indication that the attackers are part of a larger group or network, though he said there were some "indications of radicalization" by the attackers and "potential inspiration by foreign terrorist organizations." Comey also said the FBI had "nothing in [its] holdings" about the two killers.

"There were no contacts between either of the killers and subjects of our investigations that were of such a significance that it raised these killers up onto our radar screen," he said. Comey stressed that the investigation was only two days old, saying: "There is much about this that doesn't make sense ... for even those of us who do this for a living."

Earlier, a source with knowledge of the investigation told NPR that Tashfeen Malik, one of the shooters, had pledged allegiance to the leader of ISIS on a Facebook page around the time of the attack. Malik, along with her husband, Syed Rizwan Farook, carried out the bloody attack at the Inland Regional Center in San Bernardino.

The federal source who confirmed the development to NPR's Carrie Johnson also warns that the statement on social media should not be seen as evidence that the attack was coordinated or ordered by the extremist group.

The source told Carrie that Malik, 27, had pledged her support to ISIS leader Abu Bakr al-Baghdadi by using a Facebook account that was created under an alias.

Bowdich alluded to the Facebook post in the press conference, but declined to elaborate on it.

Citing details such as the crude explosive devices that investigators say were built by Malik and Farook, Carrie's federal source said that as of now, investigators are exploring the possibility that Malik and Farook may have essentially "self-radicalized" after being inspired to action by ISIS.

Malik and Farook died in a gun battle with police hours after the attack on the social services center in San Bernardino.

Last night, the authorities released the names of the 14 people who died in the attack; their ages range from 26 to 60.

A massive effort is now underway to learn more about both Farook, who was born in the U.S. and was an employee at the center, and Malik, who came to the U.S. in July of 2014 as Farook's fiancee, with a Pakistani passport. The couple had a 6-month-old child.

Two attorneys who say they are represent the Farook family, Mohammad Abuershaid and David Chesley, said Friday the killers' family was shocked by the series of events. The lawyers warned against jumping to conclusions about the attackers, repeatedly emphasizing that the FBI had found no evidence to indicate the shooters were connected with a terrorist group.

While details about the shooters emerged Friday morning, an unusual occurrence took place at the couple's former residence. The landlord at the building where Malik and Farook lived in Redlands, Calif., briefly opened their home to the media Friday, resulting in a stream of live images coming from an apartment that had only moments beforehand been boarded up.

The resulting scenes prompted questions of both journalistic ethics and legality, as reporters, photographers and even passersby had a chance to go through a residence that has been a key focus of federal and local investigators' attempts to learn more about the suspects in a mass shooting, just two days after the crime.

An MSNBC reporter broadcast live from inside the apartment, holding up snapshots of children and other people that had been on a counter.

Reports from MSNBC and CNN cited the presence of official documents such as driver's licenses and passports in the apartment. Images from the scene showed reporters poring over records, going through papers and noting the presence of religious items.

Of the media's entry, NPR's Nathan Rott reports that the landlord "says he opened it to clean earlier today. Gave media permission to enter. Didn't expect this."

The landlord tells the Los Angeles Times that the FBI had told him they were finished with the property.

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