No one immediately claimed responsibility for the attack, but the Pakistani Taliban, known as Tehrik-e-Taliban Pakistan, has stepped up its assaults in the region since its ally the Afghan Taliban seized power in neighboring Afghanistan in 2021
https://www.thehindu.com/news/international/bomb-and-mortar-attacks-in-northwest-pakistan-four-security-officers-and-two-school-children-killed/article68839906.ece