"The explosion struck at the entrance to a complex of several wedding halls," says a witness.
As per the officials, five women were confirmed dead in the attack, while seven people including children sustain injuries.
The report compiled by HEJ Research Institute of Chemistry, Karachi University found TNT material used in the Gulshan-e-Iqbal blast, which killed nine people and left over 20 injured on October 21.
The blast occurred at a ground-plus-four-story residential building, Noor Apartments, having banks and commercial shops on the ground and mezzanine floor.
The fire service had previously said on Twitter that it was responding to an incident after being called to a large explosion in Avonmouth, south west England. It said it had been joined there by the police and ambulance.
The Nangarhar Governor's spokesman confirming the casualties said some gunmen wanted to enter the district Governor's compound but were killed by security forces.