According to the police, the first incident of firing occurred in Dera Ismail Khan city when the victims were returning after attending a wedding function, Geo News reported.
The assailants, who were waiting for their targets, ambushed the victims' car killing three people and injuring two.
The victims included a policeman. Police claimed that the incident was the result of personal enmity.
Another incident occurred in Malangi Town where unidentified gunmen entered a house and opened fire at the residents killing two people.