French President Francois Hollande promised early Saturday morning that France would respond to terrorist attacks that killed more than 120 people with a "pitiless" war against the group responsible.

"We are going to lead a war which will be pitiless," he said at the Bataclan, the site of one of the attacks, according to the Guardian.

"Because when terrorists are capable of committing such atrocities, they must be certain that they are facing a determined France, a united France, a France that is together and does not let itself be moved, even if today we express infinite sorrow," Hollande added.

Hollande's remarks came after what appears to be the biggest terrorist attack ever on French soil, and some emerging signs that the Islamic State is responsible.

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