Violent clashes erupt in Barcelona as half a million separatists rally Hundreds of masked youths clash angrily with police in Barcelona on the sidelines of a mass march which drew more than half a million people in protest over Spain's jailing of nine Catalan separatist leaders. It was the biggest gathering since Monday's explosive verdict, which had already brought tens of thousands of independence supporters onto the streets in protest in this wealthy northeast region. IMAGES AND SOUNDBITES