Barcelona attacker stabbed man to death during escape: police

By Angus BerwickBARCELONA, Spain (Reuters) - Spain asked the rest of Europe to join the hunt for a young man thought to have been the driver in last week's deadly van attack in Barcelona as police said on Monday that he had also hijacked a car and killed its occupant during his escape.After driving at high speed into crowds on the city'sfamous avenue Las Ramblas last Thursday, killing 13 people, the suspected Islamist militant fled on foot and then hijacked the car as it was being parked, stabbi