Several countries as well as the European Union have offered their condolences after a powerful earthquake struck northern Afghanistan, killing 20 people and injuring hundreds, according to official reports. The country’s national disaster management authority said 20 people have died and 643 were wounded, revising down earlier figures reported by the state-run news agency Bakhtar, which had put the death toll of the overnight quake at 27, with more than 700 injured. Pakistan, India, Iran,...