Prime Minister Sir Keir Starmer says there are "serious questions for police" following the release of bodycam footage showing how officers responded to the murder of teenager Henry Nowak.
His killer Vickrum Digwa, 23, was jailed on Monday for a minimum of 21 years for stabbing Nowak with a 21cm (8in) blade he said he carried as part of his Sikh faith.
Bodycam footage shows the 18-year-old Southampton university student being handcuffed and telling police "I can't breathe" after Digwa lied to officers at the scene of the stabbing, claiming he was the victim of a racist attack.
On Tuesday evening, several hundred people gathered in Southampton, with clashes between protesters and riot police.
Speaking to broadcasters earlier in the day, Sir Keir said the bodycam footage was "really harrowing" and he'd "felt sick watching it".
Sir Keir said the question of "how accusations of racism informed decision making" must be addressed.
The Independent Office for Police Conduct (IOPC) said an investigation into the police force's actions was ongoing.
Sir Keir said he wouldn't rule out an inquiry into the matter, saying "it's important the IOPC do their work at first, but I'm not saying there shouldn't be a wider inquiry. Of course I'm not".
Warning: This story contains details some may find upsetting
Earlier, Home Secretary Shabana Mahmood called out a "dangerous undercurrent" in reaction to crimes, which she says are leading to threats.
A police officer has been "forced to relocate to protect himself and his family", after being wrongly identified online as being involved in the case, she said.
In an address to the House of Commons, Mahmood warned against opposition MPs politicising the case.
Reform UK leader Nigel Farage told reporters he had a sense of "cold rage" at the treatment of Nowak and labelling it evidence of a "two-tier Britain".
"A false accusation of racism counted higher at that moment than someone that was dying," he said.
Getty ImagesProtesters clashed with riot police on Tuesday eveningIn a statement to the House of Commons, shadow home secretary Chris Philp said the "police appeared more concerned with the accusation of racism… than they were with helping Henry".
Mahmood said that while it was for the IOPC to determine the facts of the specific case, she responded to allegations of preferential treatment by police more broadly.
"The police in this country have a sacred duty to police without fear or favour. Everyone in this country is equal before the law," she said.
The prime minister's official spokesman said there is "no such thing as two-tier policing".
Labour MP Tanmanjeet Singh Dhesi, himself a Sikh, accused Reform UK and other parties of deciding to "scapegoat" the Sikh community "based on the actions of one violent murderer."
On Tuesday evening, riot police clashed with protesters who had gathered near the scene of the murder.
The protest was promoted by far-right figure Tommy Robinson.
Bins, some bricks and an e-scooter were thrown at police, while officers with riot shields and batons attempted to hold a line along a street.
Police pelted with missiles at Henry Nowak protest
Henry Nowak case reignites claims of unfair policing
The attorney general's office is considering the jail sentence given to Vickrum Digwa after receiving "multiple requests" to review it under the unduly lenient sentence (ULS) scheme.
Under current legislation, practising Sikh's have a legal defence for wearing a small, curved blade, known as a kirpan, close to their body for religious purposes.
While Digwa had been wearing a traditional kirpan under his clothing, the weapon he used on Nowak was much bigger and he had worn it in a sheath on top of his clothes.
Digwa's family apologised to Nowak's family and for bringing the Sikh community into "disrepute".
"We love Vickrum. We will continue to love him. That love does not stand in opposition to the sorrow we feel for the Nowak family. Both are real, and both will remain with us for the rest of our lives," an unnamed family member said in a statement.
Speaking outside court, Henry Nowak's father Mark said his son "did not die with dignity"In her address, Mahmood said she "echoed" the comments of the prosecutor in the case, who said: "This is not a case about Sikhism, this is not a case about racism, this is a case about murder."
That quote was also cited by Nowak's family, who called his treatment by police "inhumane and degrading" and the force has apologised.
His dad, Mark, said: "Henry told officers that he could not breathe nine times. He told them that he had been stabbed four times. Henry was pulled across the gravel, his hands forced behind his back and he was placed in handcuffs."
He said the contrast between how his son and Digwa had been treated was "unbearable".
Three of the officers involved are still serving, and one has resigned, a spokesperson for the Hampshire & Isle of Wight Constabulary said.
Donna Jones, the Police and Crime Commissioner for Hampshire and the Isle of Wight, has separately requested a review of the culture and performance of the police force's control room and the training of officers responding to the stabbing.
Scrutiny is also turning to a document called the Police Anti-Racism Commitment, published by the National Police Chiefs' Council in 2025.
A source close to Mahmood said the document is clumsy in its wording, and it was right the language is reviewed to ensure there is no ambiguity.
It comes after Chris Philp raised concerns about the document. He highlighted a section that said producing equality of policing outcomes for people of different ethnic groups "does not mean treating everyone 'the same' or being 'colour blind'".
Police handoutVickrum Digwa was jailed for life on Monday and told he would serve a minimum of 21 yearsIn the bodycam footage, a police officer can be heard asking Nowak: "You've been stabbed, whereabouts?" before adding: "Don't think you have, mate."
While being handcuffed, Nowak says "I can't breathe" multiple times.
Later in the footage, Nowak, who seems unresponsive, is told he is being arrested for assault.
In his sentencing remarks, Judge William Mousley KC said that no matter how quickly Nowak received "first aid, CPR or expert medical treatment", he would not have survived due to the nature of his injuries.
Separately, Digwa's father Moga Singh, 52, and brother Gurpreet, 27, faced court on Tuesday afternoon on weapons charges, and were released on unconditional bail.
His mother Kiran Kaur, 53, was found guilty of assisting an offender after she attempted to hide the blade used in the attack. She will be sentenced on 17 July.
Additional reporting by Curtis Lancaster and Peter Cooke
