PESHAWAR, Pakistan — Suspected militants ambushed a vehicle carrying a government administrator in northwest Pakistan on Tuesday, killing him, two of his guards and a passerby, officials said.

The attack took place in the Bannu district of Khyber Pakhtunkhwa province, said Alam Khan, a police official. He identified the administrator killed as Shah Wali, who served in Miran Shah near the Afghan border.

The ambush came a day after a suicide bombing near a police vehicle in the northwestern district of Lakki Marwat killed a senior police officer.

No group claimed responsibility for the attacks, but suspicion is likely to fall on the Pakistani Taliban, known as Tehrik-e-Taliban Pakistan. The group, which is separate from but aligned with Afghanistan’s Taliban government, has been blamed by

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