Story highlights An ISIS leader that American officials initially said was "likely killed" in a U.S. airstrike Friday might only have been injured

Three U.S. officials told CNN that there are now signs Abu Omar al-Shishani survived the strike

(CNN) An ISIS leader that American officials initially said was "likely killed" in a U.S. airstrike Friday might only have been injured, according to growing U.S. intelligence indications.

Three U.S. officials told CNN that there are now signs Abu Omar al-Shishani survived the strike, which the Pentagon said occurred in the environs of the town of al-Shaddadi, Syria.

One official told CNN definitively, "he's alive." A second official said "there is anecdotal evidence he is alive." And a third official said there is a "small" intelligence indicator he is alive but declined to disclose the intelligence.

At least one person was observed by aircraft to have left the scene following the strike.

In an initial assessment, a defense official told reporters Tuesday that Shishani "was likely killed," along with 12 additional ISIS fighters, in a wave of strikes by drones and manned aircraft.

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