Donald Trump, who is currently in Sicily after a G7 summit, was addressing US forces for Memorial Weekend, and talking about terrorism.
He said: “The barbaric attack in Manchester and the massacre of innocent young lives – this underscores the evil we face and the urgent need for us to join forces to absolutely and totally defeat it [terrorism].”
He added: “I met with Prime Minister May and expressed the absolute solidarity of the American people.
US President Donald Trump addressing US forces in Italy for Memorial Weekend
“Just yesterday Coptic Christians in Egypt were viciously gunned down in another vile terrorist attack, one that took the lives of beautiful Egyptian children and others.
“These murderous attacks steel, and I mean steel, steel our resolve. Together civilised nations will crush the terrorists, block their funding, strip them of their territory and drive them out of this earth.”
The President’s comments come after 22 men, woman and children were killed and over 100 people injured when suicide bomber Salman Abedi blew himself up as gig goers were leaving Manchester Arena after a gig by Ariana Grande.
Manchester bombing: Harrowing scenes of terror attack at Ariana Grande concert Tue, May 23, 2017
22 people, including children have been killed and 59 injured in an explosion during a concert at Manchester Arena
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Police are treating it as a possible terror incident
Mr Trump had previously described the 22-year-old bomber as an “evil loser”.
The Manchester terror attack has been widely condemned across the world.
In a rare comment, Queen Elizabeth said: "The whole nation has been shocked by the death and injury in Manchester last night of so many people, adults and children, who had just been enjoying a concert.
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US President Donald Trump with First Lady Melania
"I know I speak for everyone in expressing my deepest sympathy to all who have been affected by this dreadful event and especially to the families and friends of those who have died or were injured.”
Prime Minister Theresa May said: "All acts of terrorism are cowardly attacks on innocent people, but this attack stands out for its appalling, sickening cowardice – deliberately targeting innocent defenceless children and young people who should have been enjoying one of the most memorable nights of their lives."
Manchester pays tribute to those killed in the terror attack
Labour leader Jeremy Corbyn said: "I am horrified by the horrendous events in Manchester last night… Today the whole country will grieve for the people who have lost their lives."