The IED was planted by terrorists near the Pak-Afghan border in Kharlachi near Kohat region.
The security forces rushed to the site and cordoned off the entire area and started a search operation.
The blast came a few days after the Pakistan Army recovered a Canadian-American family in the agency from captivity.
Earlier, officials had said that the area was hit by landmine blasts.
Kurram is one of the most sensitive tribal areas as it borders three Afghan provinces and at one point was one of the key routes for militant movement across the border.
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