The attack took place in Bannu, a district in Khyber Pakhtunkhwa province, which borders Afghanistan, police official Zahid Khan said.
A suicide bomber and several armed men detonated an explosives-laden vehicle near a security checkpoint in northwestern Pakistan on Saturday night (local time), triggering an intense firefight that killed at least three police officers, police said.
The attack took place in Bannu, a district in Khyber Pakhtunkhwa province, which borders Afghanistan, police official Zahid Khan said. He said several explosions were heard shortly after the attack and that several nearby houses and the security post collapsed under the impact of the blast.
He did not provide further details, saying that the exchange of fire was ongoing and that some police officers were injured and trapped under the rubble.
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No group immediately claimed responsibility.
However, suspicion is likely to fall on the Pakistani Taliban, known as Tehrik-e-Taliban Pakistan, or TTP, and allied militant groups that have carried out similar attacks in the past. Pakistan has witnessed a rise in militant violence in recent years.
The TTP is a separate group but allied with the Afghan Taliban, which seized power in Afghanistan in 2021.