In Germany, police have carried out a mass crackdown on activists ahead of next month’s gathering of world leaders at the G8 summit. More than 900 police officials targeted at least 40 sites across six states. Several people were arrested. Police say they were targeting protesters planning violent attacks. In Hamburg, demonstrators poured into the streets following a raid on a local youth center. Police walled off the center with barricades and used water cannons to disperse the crowds. Officials have meanwhile erected a steel wall topped with razor wire around the resort town where leaders will meet. More than 100,000 people are expected to turn out for a protest that will be confined to a town 20 miles away.