Spanish police arrested two people after a white Fiat van tore through the Las Ramblas district, which was packed with shoppers and holidaymakers.
The vehicle careered into terrified pedestrians in the busy tree-lined promenade, one of the most popular parts of the city.
Prime Minister Theresa May said she was ‘sickened’ by the attack which left a Belgian man among the dead, while the Foreign Office is trying to determine if there are British victims.
Regional interior minister Joaquim Form confirmed the latest number of injured people and warned the death toll may rise.
The two suspects in custody are a Spanish national from Melilla and a Moroccan but neither were the van driver, Catalan authorities said.
Officials are also linking the van attack to an explosion in Catalonia the previous day in which one person was killed.
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