Main party leaders were united in condemnation of Nigel Farage on Wednesday, accusing him of exploiting the the murder of Henry Nowak for “pernicious identity politics”.Sir Keir Starmer said the Reform leader’s actions were “unforgiveable” and accused him of “only pretending” to sympathise with the teenager’s family, who had specifically appealed for their son’s death not to be used to create division.Mr Farage was jeered and heckled by MPs across the chamber as he ignored demands to condemn the violent scenes at a demonstration organised by far right activist Tommy Robinson in protest at the police handling of Nowak’s stabbing.Instead, Mr Farage appeared to encourage more protests, saying the Southampton unrest was “just the beginning”.Nigel Farage was repeatedly heckled by MPs as he called on Keir Starmer to end "two-tier policing” (Parliament TV)It follows public horror at police footage of Mr Nowak’s final moments as police handcuffed him and dismissed his pleas for help because the killer’s brother had falsely claimed the victim had carried out a racist attack.The fallout came as:Polling expert Lord Robert Hayes told The Independent the political fallout from the case could affect this month’s Makerfield by-election.Sikhs revealed fears of retaliation after it emerged murderer Vickrum Digwa had carried ceremonial weapons linked to his religion.The chief constable of Hampshire Constabulary warned anyone threatening his officers online would be arrested. Southampton MPs warned rioters are not welcome in their city.But police and crime minister Sarah Jones admitted there needs to be a review of policing guidance on racism.In tense scenes at prime minister’s questions in the Commons, Mr Farage got to his feet to follow up his calls for “cold rage” over Nowak’s murder and the police actions.Starmer accused Farage of “exploiting” the murder (House of Commons)He said it “is now clear to growing millions in this country that we are living under two-tier policing,” and claimed instructions given to police officers ... are clear: “You must treat different ethnic groups in different ways.”But as MPs from all sides of the house shouted their fury, Sir Keir responded: “Exploiting this tragedy to create grievance and division would be wrong in any circumstances but to do it when the family are expressly saying, ‘Please don’t’ is unforgivable.”He had earlier thanked Kemi Badenoch for her measured "approach and tone in relation to the tragic Henry Nowak case”.She had said: “The circumstances around Henry’s wrongful arrest and tragic murder must be a wake-up call to the entire country and our institutions that every life matters, and it is the responsibility of everyone in this House to bring people together, not divide them.”Lib Dem leader Sir Ed Davey noted: “Outside court, Henry’s father made a powerful plea that his son’s murder should not be used to create further division, but should instead be used to treat knife crime as a national emergency.”Protests in Southampton turned ugly (AFP/Getty)He suggested that Mr Farage was using the tragedy as a “political football.”Alexis Boon, chief constable of Hampshire Constabulary, warned: “What people don’t see and don’t understand is that because of the divisive rhetoric out there, innocent police officers across my force are being targeted with threats, (and) their families, (with) social media abuse.“It is quite incredible, it is totally unacceptable. We’re investigating it, but it is a symptom of people using an absolutely appalling tragedy to forward their agenda and to make unacceptable threats.”Jas Singh, principal advisor to the Sikh Federation UK, told The Independent there had been a “politicisation of this case by the Far Right, Restore and Reform”, adding: “They have inflamed it and are dragging the Sikh community as a whole into this, which is highly irresponsible.”But with the Makerfield by-election taking place on 18 June, it is believed Reform hopes the issue will weigh against Labour’s candidate Andy Burnham, the Greater Manchester mayor, who wants to replace Sir Keir as prime minister if he returns to the Commons.The constituency, in the Wigan area, is 96.7 per cent white working class and in the recent local elections Reform won all the seats. Unlike Gorton and Denton down the road, where another recent by-election was won by the Greens, Makerfield has a tiny Asian population of a mere 1.2 per cent of the constituency.Lord Hayward told The Independent: “Labour MPs are right to be nervous, this by-election is going to be very tight. The Nowak case will certainly have an impact.”Separately, Ms Badenoch said the police handling of the case “must be a seminal moment for Britain on a par with the murder of Stephen Lawrence.”She said “pernicious identity politics” had seen the country “going backwards”, criticising politicians for kneeling amid Black Lives Matter protests following the death of George Floyd in Minneapolis while being restrained by a white police officer in 2020.And she criticised Mr Farage for saying the “rights and privileges of white people matter less than those of ethnic minorities”.Meanwhile, the chief constable of Hampshire, Alexis Boon, repeated his force’s apology to the Nowak family and insisted his force understood public anger.“I want to say to the family, we understand, we get it, we know why they are so distraught and upset, which is why we made the apologies.“It is a tragedy from start to finish and I’m really pleased to see that the killer was sentenced to life imprisonment.“I’m very sorry they’re having to go through this and we do understand why they are upset with the police. We completely get it.”But he aid his force was dealing with an “incredible” level of abuse following the sentencing of Vickrum Digwa, and would be investigating online abuse that involved “threats to life and threats to harm”.