Friday The 13th Paris attacks: ISIS claims responsibility

Paris (CNN)ISIS claimed responsibility for gunfire and blasts that targeted six sites Friday night in Paris, killing 128 people in one of Europe's deadliest massacres in recent years.

In an online statement distributed by supporters Saturday, the terror group said eight militants wearing explosive belts and armed with machine guns attacked precisely selected areas in the French capital.

In addition to the people killed, 180 others were injured, according to the Paris Police Prefecture. More than half of them are in critical condition.

President Francois Hollande blamed the attacks on ISIS, calling it "an act of war" by the militants. He said it was planned from the outside -- "with inside complicity."

"When the terrorists are capable of doing such acts, they must know that they will face a France very determined," he said.

In the chaotic aftermath of the attacks, there was no clarity on the number of casualties.

Earlier, the Interior Ministry put the death toll at 153 people Friday, but a day later, the Paris police lowered it to 128 people.