The rally, set to begin after Friday prayers, was being attended by the by the party’s provincial president.
Cars standing nearby were also destroyed.
According to reports, the bomb was planted in a cycle that was standing a few feet away from the stage.
"At least four people, including a young girl, were killed and eight others wounded when the bomb planted on a bicycle went off," local police official Wazir Khan Nasir told AFP.
Police personnel confirmed the death and injuries and began efforts to cordon off the area.
Eyewitnesses said there was one little girl among those injured.
No rescue teams were able to reach the scene due to the location and people began rescue efforts on their own.
The injured were shifted to the Civil Hospital.
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