According to the police, the three victims were injured in a stampede which followed the loud explosion.
The intended target of the attack was shop owner Sakhi Jan, originally a resident of Mohmand Agency, said a police official.
"This man is a Mohmand tribesman and it looks like another case of extortion. His shop was targeted in a similar manner in 2013," shared an official of the local police station.
At least 300 grammes of explosive material was used in the bomb which was a timed device, said officials of the bomb disposal unit.
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