Van plows through crowd in Barcelona, killing about 12

By Pilar Suarez and Andrés GonzálezBARCELONA (Reuters) - A van mowed through crowds of tourists on Barcelona's most famous avenue on Thursday, killing about a dozen people in an attack that was claimed by Islamic State.The head of the Spanish region of Catalonia, Carles Puigdemont, said at least 80 people had been taken to hospital and around 12 had died.Witnesses said the white van zigzagged at high speed down Las Ramblas, a busy avenue thronged with tourists, knocking down pedest