Extremism: No-one safe as sporting events become terrorism magnet

Three bombs hidden in a hedge that exploded when the Borussia Dortmund Champions League team passed by proved that no sporting event is safe from a militant attack, experts said. With the Boston marathon looming on Monday — four years after it was the deadly target of Chechen-American brothers — and sprawling events such as the Tour de France and next year’s World Cup in Russia to follow, security authorities are now on red alert.