PESHAWAR, March 16, 2016 (Xinhua) -- Security officials and rescuers gather around a damaged bus at the blast site in Peshawar, northwest Pakistan, March 16, 2016. At least 15 people were killed and 28 others injured when a bomb went off inside a bus carrying government employees in Pakistan's northwest Peshawar city on Wednesday, officials said. (Xinhua/Ahmad Sidique)