The students were apparently attacked because they were minority Shi'ite Muslims.
Taliban militants are from the majority Sunni community and attack Shi'ites as part of their strategy to fight the government. "They opened ... fire on the students and we have reports of four deaths," said Khaista Gul, an official in the administration of the Orakzai ethnic Pashtun tribal region, where the attack took place.
Tribesmen retaliated after the attack and the two sides were fighting, said residents of the area near the town of Kalaya.
Pakistani Taliban have stepped up attacks across the northwest since mid-2007, raising concern about the nuclear-armed US ally's stability.
Militants in northwest Pakistan also support the Afghan Taliban and many cross over the largely unguarded border to fight US-led foreign forces there.
Pakistani security forces have had some success against the Taliban in parts of the northwest this year and the chief of the Pakistani Taliban, Baitullah Mehsud, was killed in a US missile strike last month.
Orakzai is a stronghold of Hakimullah Mehsud who has been appointed the new Pakistani Taliban chief.
Pakistani and US officials said the militants were in disarray after Baitullah was killed and attacks appeared to tail off slightly though they have been picking up again over the past fortnight.
Twenty-two Pakistani border guards were killed in a suicide bomb attack at the main border crossing with Afghanistan in the Khyber tribal region, another Hakimullah stronghold, on Aug. 27.
Pakistani security forces launched an offensive against militants in Khyber last week and nearly 120 insurgents have been killed, according to officials.
Independent casualty figures are not available.
Peshawar: Taliban militants attacked a group of high school students on their way to school in northwest Pakistan on Tuesday, killing four of them and wounding three, a government official said.
First Published: Tuesday, September 08, 2009, 10:10