Six persons were injured when a blast occurred near Kohati Gate in Peshawar on Saturday, a private news channel reported on Saturday.
Initial reports suggested that a hand grenade was hurled that caused the blast and injured six persons. A house was also damaged due to the impact.
It is suspected that money extortionists were behind the attack, police officials said.
Police have cordoned off the area while rescue teams have kicked off the relief efforts and are shifting the injured to the hospital.