A barber shaves a customer by lantern light in his barbershop during a blackout in Sanaa, September 19, 2013. Large parts of Yemen, including the capital Sanaa, have been left without electricity after Yemeni tribesmen attacked power lines on Thursday, a Yemeni official said. The attack in the Maarib province resulted in a key power station shutting down and came less than 24 hours after tribesmen targeted another part of the grid on Wednesday. REUTERS/Mohamed al-Sayaghi (YEMEN - Tags: BUSINESS CIVIL UNREST ENERGY SOCIETY)