After travelling to Krakow, Prime Minister Donald Tusk said : “Until now in Poland we haven’t had such drastic cases of terrorism…that’s what we have to call this cruel attack on people’s lives here in Krakow.”

Krakow Mayor Łukasz Gibała has signed an order declaring a period of mourning in the city which will last until Wednesday, 11 November.

UK Prime Minister Andy Burnham said: “I’m shocked and saddened by the appalling shooting in Kraków today.”

“My thoughts are with the families of those who have lost their lives, everyone injured and all those affected by this senseless violence. The United Kingdom stands in solidarity with the people of Poland,” he added.

British foreign secretary Ed Miliband said on social media the UK government “deeply mourns” those who died in the “appalling attack”.

US ambassador to Poland Tom Rose described it as a “savage and murderous attack”.

The EU’s top diplomat, Kaja Kallas, said the shooting was “a tragedy that will be felt far beyond Poland”.

President Volodymyr Zelensky of neighbouring Ukraine called the shooting “shocking.”

“On behalf of the Ukrainian people, and personally, I extend my sincere condolences to the families and loved ones of the victims,” he wrote on social media.