(CNN)A stabbing incident in the English town of Reading that left three people dead on Saturday is not being investigated as a terrorist attack, the Thames Valley Police said.
3 people killed in stabbing incident in Reading, England
"This is not currently being treated as a terrorism incident, however officers are keeping an open mind as to the motivation for the incident and are being supported by colleagues from Counter Terrorism Policing South East," Detective Chief Superintendent Ian Hunter said.
An earlier report from the PA Media news agency, citing an unnamed source, said police were treating the incident as terror related.
Six people were injured during the incident at Forbury Gardens in Reading's town center. Three people died and three others suffered serious injuries, police said.
A 25-year-old man from Reading, who was not identified by authorities, was arrested Saturday. Police said the man was detained at the scene on suspicion of murder and authorities are not searching for other suspects.
"There is no intelligence to suggest that there is any further danger to the public, however we urge people to remain vigilant and report anything suspicious by calling police," Hunter said.
Police asked members of the public not to post images or videos of the incident on social media, but instead to report these to the police. Police also said there was no indication the incident was related to a Black Lives Matter protest that took place in Reading on Saturday.
At least two people suffering from stab wounds were being treated at the nearby Royal Berkshire Hospital in Reading following the incident Saturday, according to a hospital spokeswoman.
The South Central Ambulance Service confirmed it responded to the incident to treat "a number of casualties who had sustained injuries as a result of the incident."
The service said five ambulance crews and two air ambulance crews responded to stabbing.
One eyewitness gave an account to PA Media, describing a man who shouted before stabbing people.
"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 around a large group of around 10, trying to stab them," 20-year-old Lawrence Wort said.
"He stabbed three of them severely in the neck and under the arms, and then turned and started running towards me, and we turned and started running," Wort said.
The man stabbed another person in the back of the neck, Wort said, before running out of the park.
"My thoughts are with all of those affected by the appalling incident in Reading and my thanks to the emergency services on the scene," British Prime Minister Boris Johnson wrote on Twitter.
"Deeply concerned to hear reports of an incident in Reading," UK Home Secretary Priti Patel said. "My thoughts are with everyone involved, including police and emergency responders at the scene."
Speaking to Sky News' Sophy Ridge on Saturday, UK Health Secretary Matt Hancock said: "The police are clearly investigating, they do not ... have currently not stated that this is a terror investigation but rather a murder investigation."
Hancock added that the incident was "now an operational matter for the police."