British Prime Minister David Cameron said he was "shocked" after at least 140 people were reported killed in multiple attacks in Paris, including one near the Stade de France sports stadium.
"I am shocked by events in Paris tonight," the Prime Minister wrote on Twitter. "Our thoughts and prayers are with the French people. We will do whatever we can to help."
120 of the victims were killed at the Bataclan concert hall in eastern Paris, police said.
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The attacks, whose motive was not immediately clear, came less than a year after jihadist gunmen killed 17 people in attacks on Charlie Hebdo magazine and a Jewish supermarket.