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Three people have been killed and several others injured in a stabbing attack in a park in the southern English city of Reading on Saturday.

Sources told Sky News and Britain's Press Association that early indications suggested the incident was terror-related.

"A number of people sustained injuries and were taken to hospital for treatment," The Thames Valley Police said in statement.

The police reported arresting "a man at the scene" and urged everyone to stay away.

The Press Association said the arrested man was Libyan.

condemned the "appalling incident" at the Forbury Gardens park in the centre of the city of around 220,000.

"My thoughts are with all of those affected by the appalling incident in Reading and my thanks to the emergency services on the scene," Johnson tweeted.

A protest took place at the park earlier but organisers said the incident did not appear to be connected to the event.

Witnesses reported seeing two air ambulances and several police cars rush to the park on Saturday evening.

"An horrific, dreadful incident," policing minister Kit Malthouse tweeted.

The main opposition Labour party's leadercalled in the incident "very concerning".

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