Below is the text of the statement made by Theresa May, the Prime Minister, on 17 August 2017.
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.