A concussion grenade exploded outside the office of the UN Relief and Works Agency in the Ain al-Hilweh Palestinian refugee camp on Sunday, damaging the building complex but causing no casualties, witnesses said. Details were not immediately available regarding who was responsible for the incident, the second in the past two weeks targeting UNRWA, which has recently cut its services. The blast occurred in the early hours of the morning, when the office and surrounding streets were largely empty. Armed factions who have effective control of Ain al-Hilweh fanned out following the blast. Refugees have staged protests in recent weeks...