The attack at the Ariana Grande concert at Manchester Arena saw 22 killed and more than 800 injured. Suicide bomber, Salman Ramadan Abedi was killed instantly.
US President Donald Trump says the perpetrators of Manchester are "evil losers".
Speaking from the West Bank in Bethlehem during his first world tour as president of the United States, Trump said he would not call terrorists "monsters".
"My thought are with the people of Manchester after this terrible terroristattack. They were evil losers," he said.
"I won't call them monsters because they would like that term. They would think that was a great name. I will call them losers from now on. And we'll have more of them. But they're losers, just remember that.
"This is what I've been talking about these last few days during my trip. We can have no tolerance for this continuation of bloodshed."
Trump said the attack preyed on "innocent children." He says this "wicked ideology must be obliterated. And I mean completely obliterated."
"Civilized nations must join together to protect human life," he said.
Trump was speaking on his fourth and final day in the Middle East. After meetings with Arab leaders in Saudi Arabia, the president has been pushing the prospect of peace between the Israelis and Palestinians.
The White House said Trump was being kept updated on the attack in Manchester by his national security team.
