President Obama on Saturday refused to call Wednesday's shooting in San Bernardino an act of terrorism, even though the FBI says it now sees several signs that it was a terrorist attack.

Obama did, however, say again that it's "possible" it was terrorism.

"It is entirely possible that these two attackers were radicalized to commit this act of terror," he said in his weekly address. "And if so, it would underscore a threat we've been focused on for years — the danger of people succumbing to violent extremist ideologies."

The White House released a transcript of Obama's message at around 6 p.m. Friday, about four hours after the FBI announced that it was investigating the shooting as a terrorist event. The FBI said the "extensive planning" undertaken by Syed Rizwan Farook and his wife was one reason why the investigation was shifting toward looking for terrorism elements.

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