At least six persons were killed and 49 others injured in an explosion outside a local court in northwest Pakistan's Peshawar on Monday, police sources said.

The blast occurred at the main entrance of Sessions Court of Peshawar, the capital of North West Frontier Province. Several vehicles caught fire after the explosion, and three cars were completely destroyed. The clouds of smoke are seen rising from the place of the blast.

Police officer Karim khan said that it was a suicide attack. One suspected man blew himself up when he was challenged by security men at the gate of the court. Parts of suicide jacket, nut screws and bolts and bearings have been recovered.

Bomb disposal squad said that about six to seven kilograms of explosive materials were used in the blast.

The relief and rescue teams reached to the spot in central area of Peshawar. Police cordoned off the blast site. the injured, including three policemen and three lawyers, were shifted to a nearby hospital for treatment.

Pakistan has been suffering almost daily attacks in recent days. At least 36 people, including several army officers and 17 children, were killed and 83 injured when two Taliban suicide bombers, aided by two gunmen, raided a mosque in the garrison city of Rawalpindi on Friday.