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A woman has been slashed with a knife at Speakers' Corner in London's Hyde Park, police have said.
The 39-year-old was taken to hospital after the attack on Sunday afternoon at the site, where people gather for public speeches and debates.
The Metropolitan Police said she received a minor slash injury to the head, which was not life-threatening.
Footage shared on social media shows someone dressed in black approaching a woman wearing a Charlie Hebdo T-shirt.
She is later seen clutching her right hand close to her body, with what appears to be blood at her temple, as she is helped into a police van by officers who were nearby.