France has declared a national state of emergency and has closed its borders after more than 120 people were killed in gun and bomb attacks in Paris.
At least 100 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. Five attackers are reported killed.
Paris residents have been asked to stay indoors and about 1,500 military personnel are being deployed across the city.
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 more than 100 people had died there.
Speaking 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.
Other attacks hit Le Petit Cambodge restaurant and nearby Le Carillon in the 10th district, where a BBC reporter said he could see 10 people lying on the road, either dead or seriously injured.
And an eyewitness told Liberation newspaper that he had heard more than 100 rounds being fired at La Belle Equipe cafe in the 11th district.
There are reports of gunfire at at least one other site.