throwing youths made sporadic attacks on police stations across Athens, stoned the Interior Ministry and clashed with riot police outside Parliament on Monday in a third day of violence protesting the police shooting of a teenager. Scattered confrontations between police and protesting youths broke out around the country Monday, and in Berlin and London, youths protested at Greek diplomatic missions. Some of the worst riots Greece has seen in years began within hours of the fatal shooting of 15-year-old Alexandros Grigoropoulos in Saturday night in the often volatile central Athens district of Exarchia. Two police officers have been arrested and one is charged with murder. Self-styled anarchists and other youths have smashed and burned dozens of shops, cars and banks. About 30 civilians have been treated for minor injuries in hospitals around the country, authorities said, and Athens police report 37 policemen hurt in the capital over the weekend. Running battles between riot police firing tear gas and about 400 high school students throwing rocks broke out Monday morning in Veria, a town about 40 miles (60 kilometers) west of the port city of Thessaloniki. At the port, riot police fired tear gas at youths smashing storefronts and throwing rocks at a police station. Gangs of high school students in Crete's main city of Chania threw broken chairs, rocks and pieces of wood at riot police who responded with volleys of tear gas. And in the central city of Trikala, police clashed with youths. In the capital, hours before planned demonstrations, youths were attacking police stations and clashing with police in the streets. “Cops! pigs! murderers!” the protesters bellowed at the police. The circumstances surrounding the shooting of the teenager Grigoropoulos are still unclear. The two policemen claimed they had come under attack by a group of about 30 youths, and that three warning shots and a stun grenade were fired when they sought out the group a few minutes later. But witnesses have disputed the officers' accounts, telling Greek media that the police intended to shoot the youths.