At least seven people, including two police officials and five civilians, were killed in a blast at a market in Lakki Marwat district of Khyber Pakhtunkhwa, a senior police official said on Tuesday.
Dozens were also wounded in the blast and were shifted to nearby hospital in Bannu.
Mohammad Ishaq, the medical superintendent of THQ Hospital, said they had received 37 patients so far and that the condition of some of them was critical.
A large police contingent reached the site of the blast and cordoned off the area to collect evidence.
In March, a police vehicle was targeted by an explosion near the Rasul Khel check post in the Lakki Marwat, resulting in the martyrdom of six personnel, including a Station House Officer (SHO), while one other cop was injured.
Police said their team was on duty near the checkpoint when the blast occurred.