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LONDON —  A man has been shot and killed by police and a number of people are believed to have been injured in a major incident in central London.

Metropolitan Police said that as a precaution they were responding to the incident at London Bridge “as though it is terror-related”.

A number of ambulance crews were at the scene Friday afternoon and a “major incident” had been declared, the London Ambulance Service said on Twitter.

Images and videos on social media showed emergency vehicles on the north side of the bridge, and onlookers reported hearing what sounded like gunshots.

The police, who were called to the incident shortly before 2 p.m. local time, tweeted that circumstances around the incident remained “unclear” and that they would provide more information when possible.

Prime Minister Boris Johnson said he is “being kept updated on the incident at London Bridge and want to thank the police and all emergency services for their immediate response.”

London Bridge is a busy area of the city that houses several restaurants, bars, and businesses. A terror attack on the bridge in 2017 killed several people.

London Bridge train station, which serves the area, is closed and trains are not stopping, British Transport Police said. London mayor Sadiq Khan said he is in “close contact” with police.

(Photo provided by CNN.)