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Images of the scene taken by a Daily Star reporter show ambulances and armed police officers outside the station. The gates into London Bridge underground station have been shut and travellers have been advised to find alternative routes. A police helicopter was filmed flying overhead as the capital remains on high alert following yesterday's terror attack. A statement from British Transport Police reads: "Officers have been called to London Bridge station after receiving reports that a person had been struck by a train. "Paramedics are on site alongside officers and a woman is being treated for injuries. She will be taken to hospital for further assessment.

CHARLOTTE IKONEN Emergency services have rushed to the scene

"This incident is not being treated as suspicious." The woman was struck by a Northern Line train, according to reports, prompting the closure of the line between Camden Town and Kennington via Bank southbound. The line has since been reopened, with some minor delays. Britain's terror alert was increased to 'critical' yesterday evening, meaning a terror attack is expected imminently, in the wake of an explosion on a packed commuter train at Parsons Green tube station which left 30 people injured. As she made the announcement yesterday, Theresa May said military personnel will replace police officers on guard duties and warned the public would see a greater presence of armed police on the streets. She also urged the public to go about their “business in a normal way.”

DAILY STAR ONLINE A stretcher can be seen in the station as officers divert people away from the scene

The Prime Minister said: “The joint terrorism and analysis centre, the independent organisation responsible for setting the threat level on the basis of available intelligence has now decided to raise it from severe to critical. “This means that a further attack may be imminent. Following JTAC decision, the police have asked for authorisation from the Secretary of Defence to enact part of the first phase of Operation Tempera. "This is well-established plan to derive military support to the police.