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SAN BERNARDINO, Calif. — Investigators are looking into whether Tashfeen Malik radicalized her American-born husband and was the driving force in the San Bernardino massacre plot, two officials said Sunday.

That possibility emerged late last week when it was disclosed that the Pakistani-born Malik had pledged allegiance to the Islamic State of Iraq and the Levant in a Facebook post at about the same time she and husband Syed Farook launched their attack that left 14 people dead at a holiday luncheon Wednesday.

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Meanwhile, memorials for the victims got underway Sunday, and President Barack Obama readied a prime-time address to the nation on security and terrorism.

We’re looking at everything we can find out about these two killers’ lives – how they grew up, where they grew up, how they met

Federal investigators continued trying to establish what pushed the couple to carry out what appears to be the deadliest attack on American soil by Islamic extremists since 9/11.

“I think I can’t say definitively right now what led either of these two pick up guns and become murderers. I consider that is the focus of our investigation,” Attorney General Loretta Lynch said on NBC’s “Meet the Press.”