Prime Minister Theresa May said the UK “stands with Spain against terror” following the deadly attack in Barcelona.

Mrs May condemned the “terrible” assault in the Spanish city which saw a van plough into pedestrians and follows a spate of similar attacks in London in recent months.

She said: “My thoughts are with the victims of today’s terrible attack in Barcelona and the emergency services responding to this ongoing incident.

“The UK stands with Spain against terror.”

In a written statement, Mrs May added: “I am sickened by the senseless loss of life in Barcelona today.

“The Foreign Office is working to establish if any British nationals were involved in this appalling incident and we are in close contact with the authorities in Spain, who have our full support.

“Following the attacks in Manchester and London, Spain stood alongside the British people. Tonight, Britain stands with Spain against the evil of terrorism.”

Meanwhile, US president Donald Trump wrote on Twitter: “The United States condemns the terror attack in Barcelona, Spain, and will do whatever is necessary to help. Be tough & strong, we love you!”

London Mayor Sadiq Khan said the city stood with Barcelona “against the evil terrorism” following recent attacks in Westminster, London Bridge and Finsbury Park.

A number of other high-profile figures also voiced support for the Barcelona victims.

Labour leader Jeremy Corbyn tweeted: “Terrible reports from Barcelona. My thoughts are with those killed and injured, and the emergency services working to save lives.”

Foreign Secretary Boris Johnson said: “Concerned and saddened by #Barcelona attack. Our thoughts are with those affected. Doing all we can to identify whether Brits need help.”

French President Emmanuel Macron tweeted: “All my thoughts and solidarity from France for the victims of the tragic attack in Barcelona. We will remain united and determined.”