A Paris-style attack could "easily" happen in London or other major UK cities, Michael Fallon, the defence secretary, has warned. Mr Fallon told The Sunday Telegraph that security forces in the UK are working hard to combat the terrorist threat, but said an attack like that seen in Paris, in which 130 people were killed, cannot be ruled out. "What happened in Paris and Brussels could easily happen in London," he told the paper. "The threat from ISIS is as potent here as it was real in Paris and Brussels." He also said that the way to deal with jihadists from ISIS, the so-called Islamic State group, would only be defeated by force. The defence secretary's comments come as divisions widen between senior Labour MPs and their leader over possible airstrikes on Syria. Labour leader Jeremy Corbyn has made clear he cannot support RAF air strikes in Syria. His party members want a free vote on the issue if it is brought before parliament by Prime Minister David Cameron. Mr Fallon said he respects Mr Corbyn's views, but argued force is necessary to defeat the threat from ISIS. "These aren't people you can negotiate with. You can only deal with them by force," he said.