At least seven people including five security personnel were killed and seven others injured on Monday in a terrorist attack at a government office in Pakistan's northwestern provincial capital of Peshawar, local media and officials said. According to the reports, the incident took place when some unknown militants opened fire and hurled hand grenades at security personnel deployed at the office located at the Bara road of Peshawar, the provincial capital of Pakistan's northwestern province of Khyber Pakhtunkhwa. The militants, who were wearing security personnel uniforms, stormed the building when civil law enforcers were shifting some arrested miscreants to the Khyber House, an office of the civil administration of Pakistan's northwestern tribal region of Khyber Agency. Eyewitness said that the attackers tried to get free the prisoners and had fire exchange with the security personnel. The firing exchange that was followed by the hand grenades attacks killed six persons on the spot, including five security personnel and one attacker. Some reports said that another militant exploded his explosive jacket when security personnel tried to arrest him. At the time of the attack, the representatives of some main political parties of the country were holding a meeting in the Khyber House to devise a strategy for the upcoming general elections in the restive Khyber Agency. Soon after the incident, the personnel of Pakistan Army rushed to the site and evacuated all the people who were trapped inside the building. The commandos of the Pakistan Army were conducting a search and clearance operation in the area including nearby buildings. Rescue teams shifted the bodies and injured to the Lady Reading Hospital of the city where few of the injured were reportedly in critical condition. Some sources said that at least eight militants took part in the attack and two out of them were killed while others succeeded to run away. No group or militant organization claimed responsibility of the attack yet.