Islamic State released an undated video on Saturday threatening to attack France if bombings of its fighters continue, after gunmen and bombers killed at least 128 people in Paris.
The group's foreign media arm, Al-Hayat Media Centre, made the threat through a militant who called on French Muslims to carry out attacks.
"As long as you keep bombing you will not live in peace. You will even fear traveling to the market," said the bearded Arabic-speaking militant, flanked by other fighters.
Gunmen and bombers attacked restaurants, a concert hall and a sports stadium at locations across Paris.
The coordinated assault came as France, a founder member of the US led coalition waging air strikes against Islamic State in Syria and Iraq, was on high alert for terrorist attacks ahead of a global climate conference due to open later this month.
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Paris Public Prosecutor's spokeswoman said eight assailants had also died, seven of whom had blown themselves up with explosive belts at various locations, while one had been shot dead by police. It was not clear if all the attackers were accounted for.
"The terrorists, the murderers raked several cafe terraces with machine-gun fire before entering (the concert hall). There were many victims in terrible, atrocious conditions in several places," police prefect Michel Cadot told reporters.
"This is a horror," the visibly shaken president said in a midnight television address to the nation before chairing an emergency cabinet meeting.
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The deadliest attack was on the Bataclan, a popular concert venue where the Californian rock group Eagles of Death Metal was performing. The hall is near the former offices of the satirical weekly Charlie Hebdo, target of a deadly attack by Islamist gunmen in January.
Some witnesses in the hall said they heard the gunmen shout Islamic chants and slogans condemning France's role in Syria.
"We know where these attacks come from," Hollande said, without naming any individual group. "There are indeed good reasons to be afraid."
