At least 12 people were injured in a blast at a shop in Pakistan's Lahore city Geo News reported Friday.
The shop owner said he had been receiving threat calls for the last some days. He said he had informed the police about the phone calls in which he was asked to Rs2 million extortion.
The extortionists had also fired shots at his residence last month, he added.
The Bomb Disposal Squad said that 250 to 300 gram explosive material was used in the blast.