President Asif Ali Zardari on Friday strongly condemned the blast in Kohat that killed many people and injured several others.President Zardari who is currently in London on an official visit, in a message highly deplored the incident and said the perpetrators of such heinous crime would not be spared.The President said the government would leave no stone unturned to find the culprits and give them severe punishment under the law.He condoled with the families of the deceased and directed the medical staff to ensure proper treatment of the injured.