A woman cries as she waits for news of a relative who might have been hurt in rival militias clashes in front of Zuwara hospital April 4, 2012. Four days of fighting between the rival communities around Zuwara have killed at least 16 people on both sides and hundreds wounded. The violence has exposed how volatile Libya remains, six months after a revolt last year ended Muammar Gaddafi's rule, and how the National Transitional Council (NTC), the interim leadership, is struggling to impose its authority. REUTERS/Anis Mili (LIBYA - Tags: POLITICS CIVIL UNREST MILITARY TPX IMAGES OF THE DAY)