Islamic State (Isis) have claimed responsibility for the Paris terror attacks which left 127 people dead. The group said its fighters, wearing suicide bomb belts and carrying machine guns carried out the attacks in various locations in the heart of the capital which were carefully studied, in an official statement.

"Today brothers from all across the world set foot in Gaul and remind the kaffir (disbelievers) in dur Al Kuffr (the land of disbelievers) that we live beside you," the group said in a written statement.

"Today we reaffirm the fact we are the Islamic State. Our brothers who carried out these miracles in Gaul," they added. "We watch you when you go to sleep. And today we bring you your death."

The one page written statement appeared on the Al Hayat Media Center, one of the group's major publication arms.

They had earlier released an undated video in which one of its members said France would not live peacefully, so long it took part in bombing raids against its fighters in Iraq and Syria. During the attack on the Bataclan concert hall, witnesses claimed that the gunmen expressed support for IS and blamed the attack on President Hollande's policies in Syria.

President Hollande has declared state of emergency across France, and has deployed 1,500 troops after a near-simultaneous series of explosions and shootings brought the city to a horrified standstill overnight. The death toll rose to 127 and around 200 other people were wounded, officials said.

French police continue to hunt possible accomplices of eight assailants, who attacked concert-goers, cafe diners and soccer fans in a coordinated assault. At least six locations were attacked in the French capital.

French police officials told the Associated Press that a Syrian passport was found on the body of one of the suicide bombers who targeted France's national football stadium.

More about Paris attacks