The incident took place in the area of Kitkoot, 32 kilometres northwest of Khar, the capital of Bajaur tribal region.
"Up to five gunmen entered a mosque after evening prayers on Wednesday and opened fire on the local pro-government tribal elder Malik Juma Gul and his son, killing them both on the spot," senior local administration official Abdul Haseeb Khan told AFP.
He said Gul's two bodyguards sustained serious injuries in the attack.
Another senior local official, Shah Naseem Khan, also confirmed the deaths.
No group claimed responsibility for the attack till the filing of this report.
The incident came hours after gunmen ambushed a car of local pro-government fighters in Kooza Bandi village in the northwestern Swat Valley, and killed three people.
Bajaur is one of seven semi-autonomous districts that make up the tribal regions.
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These so called elders promise to bring peace within 15 days. Rest in peace.
The policy of protecting guests even if they are criminals is logically bound to sooner or later backfire, and that too very badly.
Pakistan is heading for a split.The Ummah is over.