A number of people have been stabbed in a serious incident in a park in Reading.
It is thought that three people may have died as a result, although that has not yet been officially confirmed.
The attack happened at Forbury Gardens at about 19:00 BST but neither the number of injured or fatalities have been officially confirmed by police.
Thames Valley Police said a man was arrested at the scene and was now in custody.
BBC correspondent Helena Wilkinson said one eyewitness told her that he saw a man move from group to group stabbing people, and then quickly leave the park.
Home Secretary Priti Patel tweeted to say she was “deeply concerned” at the incident.
She said: “My thoughts are with everyone involved, including police and emergency responders at the scene.”
Labour leader Sir Keir Starmer described the stabbing as “very concerning”.
The incident is not thought to be connected to an earlier Black Lives Matter (BLM) protest in the park, but this has yet to be confirmed.
Reading council’s leader urged people to stay away from the area.
Thames Valley Police said: “A number of people sustained injuries and were taken to hospital. A police cordon is in place in Forbury Gardens as officers investigate.
“We are asking the public to avoid the area at this time.”
BLM organisers said the incident was unrelated to a protest march in the area earlier.
Nieema Hassan said in a video message posted to Facebook: “They were very peaceful and we worked with the police liaison.
“In terms of the protest and the people who attended from Black Lives Matter, we’re all safe.
“None of us are affected. We had all left by the time this happened.”