A man allegedly shot dead his sister and brother-in-law over a domestic row in the Khwaza Khela area of Swat, police said on Monday.
The victims were residents of Shangla, according to the police.
The incident took place after a dispute over a domestic matter. The alleged assailant fled the scene after the shooting, police said.
Police have launched an investigation and a search is underway to arrest the suspect.
The bodies of the victims were shifted to Khwaza Khela Hospital for post-mortem examinations, police said.