LONDON — Several people were injured on Saturday in a stabbing attack at a park in southern England where a Black Lives Matter protest had been held earlier in the day, according to the police.
The police arrested a man at the scene but have not yet indicated what the motive behind the attack in the town of Reading might be.
“Officers, along with other emergency services, were called to Forbury Gardens, Reading at around 7 p.m. following reports of a stabbing that had taken place,” Thames Valley Police said.
Some social media posts initially said the attack happened during the Black Lives Matter protest. But Lawrence Wort, a 20-year-old personal trainer who said he had witnessed the attack, disputed that. He said the protest had ended at least three hours before the stabbings.
“The park was pretty full, a lot of people sat around drinking with friends when one lone person walked through, suddenly shouted some unintelligible words and went round a large group (of about 10 people) trying to stab them,” Mr. Wort said in a message on Twitter.
He said the man’s eyes “looked like he was on some sort of drugs.” The assailant stabbed three people in the neck and under the arms before turning and running toward Mr. Wort, who said he ran to escape.
The attacker then turned his attention to another group of people who were sitting, stabbing one of them in the back of the neck, Mr. Wort said. When he realized that everyone had started to run, the assailant left the park, he continued.
Nieema Hassan, one of the organizers of the Black Lives Matter protest at Forbury Gardens, said in a video message on Facebook that the incident had nothing to do with the protest and none of the protesters were affected as they had all left the park by the time the attacks happened.
“They were very peaceful — we worked with the police liaisons the entire time,” she added.
The British prime minister, Boris Johnson, tweeted: “My thoughts are with all of those affected by the appalling incident in Reading and my thanks to the emergency services on the scene.”