In Nigeria, suspected Boko Haram suicide bombers have killed at least 13 people and injured 53 in an attack on a market in the northeast town of Biu in Borno state. <br/><br/>In addition to 13 people, two bombers were killed. Officials said, the blasts struck while aid workers were distributing food to people affected by the eight-year conflict with Boko Haram.<br/>Today's attack bore the hallmarks of Boko Haram, which uses suicide bombers, often women and girls, to attack crowded public spaces.<br/><br/>Last week, a suicide bombing at a mosque in the northeastern town of Mubi killed at least 50 people, one of the deadliest attacks in recent years.