In the ten months since its stunning capture of Mosul, Iraq's second-largest city, the Islamic State has expanded its reach beyond its geographic base, establishing a foothold in countries such as Libya. A vicious suicide attack in Afghanistan now raises fear that the war-torn country may be next. On Saturday, an unidentified man detonated explosives inside a crowded bank in Jalalabad, a city located near the country's border with Pakistan, killing 33 and injuring over 100.