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An eye witness has described the moment a van crashed into a crowd in the Ramblas tourist area in the centre of Barcelona.

Police are treating it as a terror attack as many people are said to have been injured in what's being described as a "massive crash".

Eyewitness Tom Gwella told PM presenter Carolyn Quinn that he heard screams and a crash and "saw the crowd parting and this van going full pelt down the middle of Las Ramblas... it wasn't slowing down at all."

(Photo: Police and Ambulance on Las Ramblas after van crashed into crowd Credit: Getty Images)