Sir Keir Starmer has led Britain's tributes to Conservative activist Charlie Kirk who died after being shot in the neck during an event at a US university.
The Trump ally was shot as he started to conduct a question and answer session with students at Utah Valley University today.
Donald Trump later confirmed his death to social media, paying tribute to the 31-year-old who was "loved and admired by all".
“The Great, and even Legendary, Charlie Kirk, is dead, the US President wrote to Truth Social.
“No one understood or had the Heart of the Youth in the United States of America better than Charlie.
“He was loved and admired by ALL, especially me, and now, he is no longer with us. Melania and my Sympathies go out to his beautiful wife Erika, and family. Charlie, we love you!”
Sir Keir Starmer is among the UK politicians to have paid tribute to Mr Kirk.
The Prime Minister wrote on X: "My thoughts this evening are with the loved ones of Charlie Kirk.
"It is heartbreaking that a young family has been robbed of a father and a husband.
"We must all be free to debate openly and freely without fear - there can be no justification for political violence."
Charlier Kirk was shot while answering questions from students at Utah Valley University
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Former Prime Minister Boris Johnson described his death as a "tragedy".
"The murder of Charlie Kirk is a tragedy, and a sign of the utter desperation and cowardice of those who could not defeat him in argument, he posted to social media.
"Charlie Kirk has been killed not for espousing extremist views - because he didn’t.
"He has been killed for saying things that used to be simple common sense.
"He has been killed because he had the courage to stand up publicly for reasonable opinions held by millions and millions of ordinary people both in the US and Britain.
"The world has a shining new martyr to free speech. Our thoughts and prayers are with his family and loved ones."
Boris Johnson described Charlie Kirk's death as a 'tragedy'
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Conservative leader Kemi Badenoch issued a warning to the "rising intolerance of opposing views" as she paid tribute to Mr Kirk.
"There are no words good enough to express the horror of this", she wrote to social media.
"The killing of Charlie Kirk is a blow to everything Western civilisation stands for: open discourse, robust debate and peaceful dissent.
"He lived his life by those very principles, no matter the danger it put him in.
Kemi Badenoch warned of the 'rising intolerance of opposing views' as she paid tribute to Charlie Kirk
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"This may have happened far from our shores, but the rising intolerance of opposing views affects us all.
"We cannot turn a blind eye to it. My thoughts are with Charlie’s family, his wife Erika, and their children."
Foreign Secretary Yvette Cooper posted to X: "Deeply shocked by the killing of Charlie Kirk in Utah.
"Political violence has no place in our societies. Our thoughts and condolences are with his family."
Charlie Kirk died at age 31
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US police say a suspect is in custody and they are investigating investigating the incident.
FBI Director Kash Patel said: “We are closely monitoring reports of the tragic shooting involving Charlie Kirk at Utah Valley University.
"Our thoughts are with Charlie, his loved ones, and everyone affected.
"Agents will be on the scene quickly and the FBI stands in full support of the ongoing response."
Mr Kirk co-founded the conservative activist group Turning Point USA and lead multiple related political organisations.