A club statement said: "FC Barcelona wants to express its profound sorrow and utter disgust at the terrorist attack that has hit the heart of our city, la Rambla de Barcelona. The Club wishes to send our support and thoughts to the victims, their families and friends as well as the people of Barcelona and its visitors.

"As a mark of respect, the flags will fly at half-mast at the club's installations and the players from both teams will wear black armbands in all the club's matches this weekend.

It is a sad day for Barcelona and the world.