At least four people were killed when a suicide bomber targeted the office of a property dealer in Peshawar, the capital city of northwest Pakistani province of Khyber Pakhtunkhwa Friday night.

Federal Minister Bashir Bilaur told media that a suicide bomber rammed his explosive-laden vehicle into the office of a property dealer, Astana Gul, at Ring Road area of Peshawar.

There were four people inside the building when the blast took place. Following the explosion, the office building was razed to the ground.

Police and rescue workers recovered the dead bodies of all the four people.

Later talking to media, Mian Iftikhar Hussain, Information Minister of Khyber Pakhtunkhwa told media that the target of the blast -- Astana Gul is the leader of a banned outfit of militants, however he was not present inside the building at the time of blast.

He said that an internal war is going on between two groups of militants so they are targeting each other.

An estimated 30 to 40 kgs of explosive materials were used in the attack.

Earlier on Monday, four people were killed and seven others injured when a suicide bomber targeted the house of a tribal leader Haji Akhonzada in Peshawar killing him and his son-in-law.