ISLAMABAD: President Mamnoon Hussain and Prime Minister Nawaz Sharif have expressed deep grief over the loss of precious lives in the blast. The president has prayed for eternal peace for the departed souls and expressed sympathies with the bereaved families and the injured. He vowed that terrorism will be rooted out from the country as militants cannot discourage them with such cowardly activities. In a statement from the Prime Minister House, the premier expressed grief over the blast and sought a report in this regard. He also directed authorities concerned to provide best medical facilities to the injured. Interior Minister Chaudhry Nisar also condemned the attack and sought an immediate report of the incident. Eight people were killed while 21 were injured in an explosion in an under constriction building at Y Block in Defence House Authority Lahore.