In a suicide attack at Rescue 15 building and adjacent CCPO Lahore 23 persons were killed and around 250 people were injured. The deceased included 16 policemen and seven officials of an intelligence agency. The injured were admitted at Ganga Ram and Mayo Hospitals, Lahore . The buildings of Rescue 15 and CCPO office were collapsed in the attack. Police have arrested two suspect from the scene of the blast. Police sources said some 40 persons are on duty in the Rescue 15 building. Rescue teams rushed to the point to start relief work. The area, including offices of security agencies, has been cordoned off by the agencies. The powerful blast was heard even outside the radius of one kilometre. According to reports the building of Rescue 15 was completely razed to ground while a portion of the nearby CCPO Lahore office was also collapsed in the attack. The rescuers were trying to take out the people trapped under the debris of the collapsed buildings. The sounds of firing were also heard after the blast, eyewitness said. Emergency has been declared at all hospitals of Lahore . The forces have cordoned off the area after the blast. At least 40 vehicles were also destroyed in the attack.