Federal Trade Commission and state and local prosecutors in 29 states said they have taken legal action in 57 cases that bilked thousands of consumers nationwide. Most of the cases involved transactions on San Jose-based eBay, which accounts for an estimated 90 percent of global online auctions. In the German capital Berlin, concertgoers last night errupted into a riot, throwing rocks, overturning cars and fighting with police. The Nigerian navy was today preparing to free 97 foreigners taken hostage on oil rigs by striking workers.”]