A spate of mass brawls in German outdoor swimming pools has led to calls for better security at the popular summer bathing spots. As temperatures soar across the country, many people traditionally head for their local municipal outdoor swimming pool. But over the last few years the start of summer has also been plagued by headlines of violence and mass brawls at open-air pools. And this summer is no different. A number of incidents have been reported in the last week alone. On Wednesday evening dozens of police officers cleared and shut down an outdoor swimming pool in the Berlin...