French President Francois Hollande blamed the Islamic State group for orchestrating the deadliest attacks inflicted on France since World War II and vowed Saturday to strike back without mercy at what he called "an act of war."

Hollande said at least 127 people died Friday night in shootings at Paris cafes, suicide bombings near France's national stadium and a hostage-taking slaughter inside a concert hall.

Speaking after an emergency security meeting to plan his government's response, Hollande declared three days of national mourning and raised the nation's security to its highest level.

Hollande blamed the carnage on what he called "a terrorist army, the Islamic State group, a jihadist army, against France, against the values that we defend everywhere in the world, against what we are: a free country that means something to the whole planet."

As he spoke, French anti-terror police worked to identify potential accomplices to the attackers known to have committed the attacks.

The perpetrators, at least in public, remained a mystery: their nationalities, their motives, even their exact number. Authorities said eight died, seven in suicide bombings, a new terror tactic in France. Police said they shot and killed the other assailant.

World leaders united in sympathy and indignation, New York police increased security measures, and people worldwide reached out to friends and loved ones in France.

The violence raised questions about security for the millions of tourists who come to Paris and for world events routinely hosted in the normally luminous capital, where troops were deployed to support police trying to restore order.

One of Europe's most heavily visited tourist attractions, the Disneyland theme park east of the capital, announced it would not open for business Saturday, a rarity.

Prosecutor's office spokeswoman Agnes Thibault-Lecuivre said authorities couldn't rule out the possibility that other militants involved in the attack remained at large.

Hollande said France '€” which is already bombing IS targets in Syria and Iraq as part of the U.S.-led coalition, and has troops fighting militants in Africa '€” "will be merciless toward the barbarians of Islamic State group."

"It's an act of war that was prepared, organized, planned from abroad, with internal help," he said.

Reflecting fears in other European capitals of the risk of coordinated or copycat attacks, the British government scheduled its own emergency COBRA intelligence committee overseen by Prime Minister David Cameron. Italy said it, too, was raising security levels on borders and major public places.

Friday night's militants launched at least six gun and bomb attacks in rapid succession on apparently indiscriminate civilian targets.

Three suicide bombs targeted spots around the national Stade de France stadium, north of the capital, where Hollande was watching an exhibition soccer match between France and the defending World Cup champions Germany. Fans inside the stadium recoiled at the sound of explosions, but the match continued amid rising spectator fears.

Around the same time, fusillades of bullets shattered the clinking of wine glasses in a trendy Paris neighborhood as gunmen targeted a string of cafes, which were crowded on an unusually balmy November night. At least 37 people were killed, according to Paris Prosecutor Francois Molins. (bbn)

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