Secretary of State John Kerry vowed Saturday that the U.S. and other world powers would "fight back" against the acts of terror that rocked Paris Friday night and left more than 120 people dead.

"[W]e are witnessing a kind of medieval and modern fascism at the same time, which has no regard for life, which seeks to destroy and create chaos and disorder and fear," Kerry said in Vienna, Austria, where the U.S. and other countries were meeting to discuss the civil war in Syria.

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"And the one thing we can say to those people is that what they do in this is stiffen our resolve, all of us, to fight back, to hold people accountable, and to stand up for rule of law, which is exactly what we are here to do," he said. "And if they've done anything, they have encouraged us today to do even harder work to make progress and to help resolve the crises that we face."

While French President Francois Hollande has blamed the Islamic State for the attacks, Kerry stressed in Vienna that at this point, "we don't know who did it." Still, he called the series of shootings and suicide bombings "terrorist attacks."

Kerry spoke along side Russian Foreign Minister Sergey Lavrov, who also didn't assign blame specifically to the Islamic State. But Lavrov did note other attacks for which the Islamic State has claimed credit.

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