Rescue workers carry the body of a blast victim into an ambulance following a blast in Pakistan's Swat valley. AFP
The blast happened on Tuesday night in Kabal town in the Swat valley, which was largely ruled by the Pakistan Taliban during a 2007-2009 insurgency.
For years Islamabad encouraged tribal vigilante forces known as peace committees to defend their villages against militants.
Most have been disbanded since the insurgency was largely crushed and security improved across the country.
Clash erupts between Kyrgyz, Tajik border guards
Armenia reports new round of clashes with Azerbaijan
Swat district police officer Zahid Nawaz Marwat told the media that former peace committee head Idrees Khan was killed when his pick-up truck was hit by a roadside bomb.
Another local police official confirmed the death toll, which included two local policemen, two private guards and three labourers.
Tehreek-e-Taliban Pakistan leaders.
The attack was claimed by the outlawed Tehreek-e-Taliban Pakistan (TTP), who said Khan was involved in the killing their members.
The group also claimed responsibility for a clash with Pakistani military in which three soldiers were killed on Tuesday in Kurram district, bordering Afghanistan.
The TTP declared an indefinite ceasefire in June to facilitate peace talks being brokered by Afghanistan, but there have been regular clashes since then despite both sides saying the truce was still on.
Since the Taliban returned to power in Afghanistan last year Islamabad has regularly complained of attacks by the TTP, especially along their porous frontier.
The Pakistan and Afghanistan Taliban are separate groups, but share a common ideology.
Abdus Samad Khan, Bajur District police chief, said the two constables were on security duty near the Raghan Dam when unknown assailants detonated the bomb remotely, killing them both. He said a search for those involved in the bombing was under way.
The banned Tehreek-e-Taliban Pakistan gave a higher death toll in Saturday's attack in Khyber Pakhtunkhwa province, saying eight soldiers died. There was no immediate explanation for the discrepancy.
Kaleem Qureshi, spokesman for the country's Counter-Terrorism Department, said officers seized a bomb and weapons from the hideout of the slain men in the town of Rajanpur in Punjab province.
"This year also marks the 55th anniversary of the first United Nations Conference on the Exploration and Peaceful Uses of Outer Space (UNISPACE).
During the meeting, they reviewed the ties between the two friendly countries across various domains and ways of enhancing them to achieve their common interests.
The impoverished Central Asian country with ties to Russia and China has seen three presidents resign over political crises fuelled by corruption, nepotism and disputed votes since gaining independence from the Soviet Union in 1991.