France has declared a national state of emergency and has closed its borders after at least 40 people were killed in multiple gun and bomb attacks in Paris.
At least 15 people were killed at the Bataclan concert hall, where gunmen took up to 60 people hostage.
Police have now stormed the venue and killed two attackers, French media say.
Others died in attacks near the Stade de France, with some reports suggesting a suicide blast, and at restaurants in central Paris.
Paris residents have been asked to stay indoors and military personnel are being deployed across the city.
The deadliest attack appears to have targeted the Bataclan concert hall. The BBC's Hugh Schofield says scores of ambulances have arrived at the scene, suggesting many victims inside.
Other attacks hit neighbouring Le Petit Cambodge and Le Carillon restaurants in the 10th district where a BBC reporter 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.
President Obama in Washington came to the White House Briefing room to express solidarity and offer aid and condolences. “Once again, we’ve seen an outrageous attempt to terrorize innocent civilians,” he said. “This is an attack not just on Paris, it’s an attack not just on the people of France, but this is an attack on all of humanity and the universal values that we share.”
There was no immediate claim of responsibility, but Twitter erupted with celebratory messages by members and sympathizers of the Islamic State, the extremist group based in Syria and Iraq that is under assault by major powers including the United States, France and Russia.
The main shooting appeared to have broken out at a popular concert hall, The Bataclan, where the American band the Eagles of Death Metal was playing, and French news services said as many as 100 hostages may have been taken there.
Source: BBC