One casualty has been confirmed while 25 people were injured in a suicide attack on a staff bus of a government department, report said here Thursday. The incident occurred in Chohar Chowk area, near Peshawar road, where a motorcycle bomber hit a bus carrying the employees of Kahota Research Laboratories (KRL) towards Mandra area of the metropolis. Blast was as powerful as it also destroyed the nearby vehicles of the targeted bus and injured few passersby as well. Police and rescuers have rushed the scene and were carrying out relief activities. At least 25 injured have been transferred to the local hospitals of the city where emergency has already been declared. Condition of eleven injured was stated to be critical, it was reported.