Theresa May said her thoughts were with the victims and families of those affected in the Manchester incident, which is being treated as an "appalling terrorist attack".
The Prime Minister said the authorities were working to establish what happened at the Manchester Arena, after 19 people were confirmed dead following reports of an explosion at an Ariana Grande concert.
Mrs May said: "We are working to establish the full details of what is being treated by the police as an appalling terrorist attack.
"All our thoughts are with the victims and the families of those who have been affected."
A Tory source said the Prime Minister's General Election campaign was being suspended.
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