Police were bracing for more violence at demonstrations planned Monday across Greece to protest the fatal police shooting of a 15-year-old boy in Athens. Dozens of stores, banks and cars were torched or smashed in weekend rioting after the teenager was shot late Saturday in circumstances that remain unclear. The weekend riots were the worst Greece has seen in years, with police holding overnight running battles and firing volleys of tear gas at rampaging youths who left parts of Athens' main shopping district gutted and looted. Rioters were still barricaded Monday morning at two university campuses in Athens, while youths blocked two main roads in the capital and an urban rail system. Demonstrations also turned violent Monday in a small central Greek town of Trikala, where one policeman was reportedly injured and blocked a nearby national rail route.