Among the three killed were an eight-year-old girl and a senior citizen.
The child died after she was hit by an aerial bullet in Azizabad.
A probe has been initiated and officials assured of strict action who were involved in the aerial firing.
Earlier in January, at least 42 people including five women were killed in a firing incident that occurred in Karachi.
Another 233 people have suffered injuries.
Pakistan, which is into the 78th year since its inception, celebrates Independence Day on August 14.