Security officials on the explosion site told The Express Tribune that they were on routine patrol when the explosion took place near their vehicle, killing three personnel.
An official of the political administration while confirming the casualties said that two civilians were also killed in the explosion.
The security officials that those killed included two Frontier Corps personnel and one official of the Bajaur Levies.
The area was cordoned off by the security forces and a search operation was launched which is still underway in the area.
Assistant Political Agent Tariq Khan along with other officials reached the site along with a large number of security officials.
Officials said that the injured were rushed to Agency Headquarter Hospital in Khar. One of the injured, identified as Yar Rehman is said to be in critical condition.
The area lies adjacent to the tumultuous Kunar province of Afghanistan.
Correction: An earlier version of the article had incorrectly stated that two Frontier Constabulary personnel were killed in the blast. The error has been corrected.
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