British police said Saturday that “a number of people” were injured with reported stab wounds in a park in the southern English city of Reading.
The National Police Chiefs’ Council described it as a “serious incident.”
“A number of people sustained injuries and were taken to hospital for treatment,” The Thames Valley Police said in statement.
Witnesses reported seeing two air ambulances fly in and land at a public park in the centre of the city of around 220,000.
The police reported arresting “a man at the scene” and urged everyone to stay away.
The BBC and Sky News said two people had been taken to Reading’s Royal Berkshire Hospital with apparent stab wounds.
None of the initial reports suggested a terror motive.
A Black Lives Matter protest took place at the park earlier but organizers said the incident did not appear to be connected to the event.
Home Secretary Priti Patel said she was “deeply concerned.”