Mr Vance made the comments on X after the US state department also commented on the case saying “two-tiered policing” must be rejected in the West.
Downing Street has responded accusing “people” of “seeking to stir up division on our streets”.
The US vice president claimed the 18-year-old student would “still be alive today… if the last few generations of European elites had stood their ground against the politics of self-hatred and the mass invasion of migrants, many of whom despise the West and the people who love it”.
“Henry was far from the first to so needlessly lose his life, and I fear he won’t be the last. Each time a life like his is lost, the proper response-the only response-is righteous anger,” he added.
A No 10 spokesperson said: “In recent days we have seen people trying to interfere in our democracy and seeking to stir up division on our streets.
“The Nowak family are grieving after Henry’s horrific murder. They have said they do not want his death to be used to create further division, hatred or tension. We should be respecting their wishes.
“Our politics should bring people together even in the most terrible of circumstances. That is who we are as a country.”
Mr Nowak was handcuffed by police officers who ignored his pleas that he had been stabbed as he lay dying after his killer, Vickrum Digwa, claimed to have been the victim of a racist attack.
Downing Street rejected “any suggestion of two-tier policing across the United Kingdom”.
And earlier, responding to remarks from the US state department, deputy PM David Lammy said: “I don’t recognise… this caricature of Britain having a two-tier criminal justice system. I just don’t recognise that.”
Prime Minister Sir Keir Starmer and Nigel Farage clashed in the Commons earlier this week, after the Reform UK leader hit out at what he called “two-tier policing”.
Digwa was been given a life sentence with a minimum of 21 years in prison for stabbing Mr Nowak with a ceremonial knife with a 21cm blade, which he carried as part of his Sikh religion.
The Independent Office for Police Conduct is investigating Hampshire Police’s response in Mr Nowak’s case.
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