"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," said May in a statement, as the Guardian reports.
Earlier, Greater Manchester police stated they are treating this as a "terrorist incident until police know otherwise." Meanwhile NBC reports "multiple U.S. officials say U.K. authorities suspect Manchester incident was conducted by a suicide bomber" and according to CNN the bomber's body has now been identified.
Manchester mayor Andy Burnham tweeted his condolences to families who lost loved ones and praised the city's emergency services, calling this a "terrible night for our great city."
My heart goes out to families who have lost loved ones, my admiration to our brave emergency services. A terrible night for our great city
— Mayor Andy Burnham (@MayorofGM) May 23, 2017
As well, minister of state for security Ben Wallace issued a statement calling for vigilance and imploring citizens to report anything suspicious.
"In the light of the attack in Manchester tonight, please be vigilant and if you see anything suspicious call the anti-terrorist hotline: 0800 789123," he said. "My thoughts are with all the victims of the incident tonight and our emergency services who are out there tending wounded and keeping us safe."