The blast came just hours after an explosion rocked Khair Khana area around 9:30 am in which at least four people were killed and twelve others injured.
According to security sources, the second blast occurred around 8pm after a police vehicle hit a roadside mine in the area.
No group has so far claimed responsibility behind the two blasts.
Taliban insurgents and other anti-government militants including Islamic State terrorists are frequently attempting to target security forces in the country.
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