Holder: Not yet sure which group behind Paris attack

Source: Terror cells may have been activated in France
Source: Terror cells may have been activated in France

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Source: Terror cells may have been activated in France 01:10

Washington (CNN)Attorney General Eric Holder said Sunday that "we don't have any credible information" yet on whether a terrorism organization sponsored the attack in Paris -- and if so, which one.

Al Qaeda in the Arabian Peninsula, which Holder said "remains the most dangerous of the al Qaeda cells," has claimed responsibility for the attack on the satirical newspaper Charlie Hebdo.
But he said during an appearance from Paris on CNN's "State of the Union" that the United States hasn't yet confirmed that, even though the intelligence community remains "constantly focused" on that cell.
    "We don't have any credible information, at least of yet, to indicate who was responsible -- who sponsored this act. That is clearly one of the things that we have to make a determination of," he said.