Pakistan's Prime Minister Syed Yousuf Raza Gilani Tuesday strongly condemned the bomb blast in 'Dera Ismail Khan city' that claimed several innocent lives. The Prime Minister in a message strongly criticized those who committed the heinous act and directed the authorities to investigate the matter and apprehend those responsible. The Prime Minister in a message to the families of those killed expressed his deep grief and sorrow over the loss of lives and sympathy to those injured, according to a report of the Associated Press.