The deadly explosion occurred in the town of Mamond, some 25 kilometers from Khar, the major town of Bajaur, one of the seven tribal areas in Pakistan's Federally Administered Tribal Areas (FATA), on Sunday.
On August 22, Trump indicated that single-minded approach would extend to U.S. relations with troubled ally Pakistan, which consecutive USA administrations have criticized for links with the Taliban and for harboring leading militants.
The official further added that five Levies personnel were patrolling in Garigal area when the vehicle was targeted with a remote-controlled explosive device.
Pakistani Army have launched a massive search operation in the area to nab the blast executors and have cordoned the area.
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Muhammad Khorasani, a spokesman of the Tehrik-e Taliban Pakistan, claimed responsibility for the attack.
Bajaur Agency has seen intense fighting between militants and security forces in the past.
Violence in Pakistan has declined in recent years following a series of military offensives against insurgents along the northwestern border.
Asif also said that Pakistan would reproach the US for its new Afghanistan policy at the United Nations General Assembly next week, saying "the Trump administration is following a militaristic approach and that policy has already failed".