<sod >At least one person has died and dozens have been injured after a white van ploughed into a crowd of people in Las Ramblas area of Barcelona, in what Catalan police say is a potentially ongoing terrorist attack.< eod>< sod > At least 13 people have died and 50 have been injured after a white van ploughed into a crowd of people in Las Ramblas area of Barcelona, in what Catalan police say is a potentially ongoing terrorist attack.< eod>