US President Donald Trump has described the mass shooting in Las Vegas, in which at least 59 people were killed and 527 injured, as an "act of pure evil".
A gunman began shooting from the 32nd floor of a hotel during a country music festival for several minutes, before taking his own life.
In a televised address, Mr Trump said that he will travel to Las Vegas on Wednesday.
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British Prime Minister Theresa May has said that she has spoken to Mr Trump to pass on her condolences after the shooting, and added that the UK would offer any help US investigators needed.
"This was an individual shooting randomly - a completely senseless and cowardly attack - and so many people have been killed and injured," she said in a televised interview.
"I have offered the United States every assistance that we can to support them in their investigation," Mrs May added.
German Chancellor Angela Merkel said that she was "shocked" by the mass shooting.
In a statement she said: "I was shocked by the news from Las Vegas. Our sympathy and condolences go to the relatives and families of the victims."
Former US president Barack Obama said the mass shooting was a "senseless tragedy", while former president Bill Clinton said that the incident should be "unimaginable in America".
Former US secretary of state Hillary Clinton also condemned the attack. In a post on Twitter, she said that action must be taken against the National Rifle Association in the US.
In a statement, the Vatican said that Pope Francis was deeply saddened by the shootings. It said: "Deeply saddened to learn of the shooting in Las Vegas, Pope Francis sends the assurance of his spiritual closeness to all those affected by this senseless tragedy."
Russian President Vladimir Putin also expressed his condolences in a message to Mr Trump, saying the mass shooting was "shocking in its cruelty."
"The crime that has taken the lives of tens of peaceful civilians is shocking in its cruelty," Mr Putin said according to a statement from the Kremlin.
