A van driver ploughed into crowds of pedestrians on Barcelona's most popular street in broad daylight, killing at least 14 people. The Islamic State terror group has claimed responsibility for the attack.
Police later shot dead five suspects after a second vehicle attack in the coastal town of Cambrils, around 130- kilometre from Barcelona.
In a statement personally signed Elizabeth R, the 91- year-old monarch said that she and husband Prince Philip sent their "sincere condolences" to those who lost their loved ones.
"It is deeply upsetting when innocent people are put at risk in this way when going about their daily lives. Our thoughts and prayers are with those who have lost loved ones and the people who are recovering in hospital. Please convey our heartfelt sympathies to all who have been affected by these appalling incidents," it said.
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The Queen and Prince Philip had only recently hosted a State Visit to Britain by the King of Spain and his wife Queen Letizia.
Citizens of 34 countries were among those killed and scores injured in the Barcelona and Cambrils attacks.
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