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The explosion took place in Chamarkand town, 40 kilometres northwest of Khar, the main town of Bajaur tribal region.
"Two members of a pro-government tribal peace committee were killed when an improvised explosive device (IED) went off near them," local administration official, Ghulam Saeedullah told AFP.
He said that the men were inspecting the site of an earlier IED blast when a second device went off.
Local tribal police officials also confirmed the incident and casualties.
A day earlier, militants armed with guns and rockets killed two members of the militia and wounded two policemen in Bajaur.
The attack came two days after about a dozen insurgents attacked the homes of two tribal elders near Khar and later killed them.
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