A firefighter inspects the scene of an explosion at a building housing business stalls in Moi Avenue at the centre of Nairobi, capital of Kenya, May 28, 2012. At least 30 people were taken to hospitals in seriously conditions following the mid-day explosion. Mathew Iteere, Kenya's Police Commissioner, said investigations were underway, and that the Kenya Power company has been asked to investigate the possibility of an electrical fault within the building. [Xinhua]