France has declared a national state of emergency and has closed its borders after at least 120 people were killed in gun and bomb attacks in Paris.
Some 80 people are reported to have died at the Bataclan concert hall in central Paris.
Gunmen took many hostages there before being overpowered by police.
Others died in a reported suicide blast near the Stade de France and gun attacks on city centre restaurants. Seven attackers are reported killed.
Paris residents have been asked to stay indoors and about 1,500 military personnel are being deployed across the city.
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Media captionSpeaking outside the Bataclan concert hall President Hollande said the attacks were "an abomination and a barbaric act"
The deadliest attack appears to have targeted the Bataclan concert hall, with unconfirmed reports saying that some concert-goers were shot after being taken hostage. Police sources told AFP news agency that at least 100 people had died there.
Speaking after arriving at the concert hall, President Francois Hollande said the attackers would be fought "without mercy".
At least three gunmen are reported to have been killed at the venue.
