A Pakistani man reads a newspaper at a closed market in Karachi on Wednesday following the arrest of Altaf Hussain. For more than two decades, Hussain has wielded control over his party — and, by extension, parts of the city — from half a world away in London. Asif Hassan/AFP/Getty Images hide caption

itoggle caption Asif Hassan/AFP/Getty Images

Pakistanis check the site of a bomb blast in Karachi on Sunday. Pakistani officials say the blast has killed dozens of people in a neighborhood dominated by Shiites. Fareed Khan/AP hide caption

itoggle caption Fareed Khan/AP