The gunmen ambushed the vehicle of Jamaat-e-Islami leader Shad Nawaz Khan when it was passing through Rabaat area of Lower Dir District, police said.
Khan's brother Sohail Khan died on the spot, they said.
Constables Wahab and Zubair, who reached the spot during the fire exchange, were also killed in the cross firing.
The attackers jumped into the River Panjkora and fled, police said. The reason behind the killing of Sohail was stated to be an old enmity.
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