According to reports a bomb went off outside a government office in Jamrud at least three people including an official of paramilitary Khasadar Force killed over 50 persons were injured.
According to some reports citing government officials, it was a suicide attack.
Security officials cordoned off the area and started a search operation after the terrorist attack.
Nobody immediately claimed responsibility for the bombing.
Reuters reports: A suicide bomber on Tuesday killed at least three people and wounded dozens in Pakistan’s volatile northwest where security forces are fighting the Taliban and their allies, officials said.
The attack targeted a paramilitary vehicle in the Jamrud area of the Khyber tribal agency, official Shaukatullah Afridi, who was metres away from the blast, told Reuters.
The vehicle belonged to the Khasadar, or tribal police force. At least 43 wounded were rushed to hospital in Peshawar, about 20 km (12 miles) to the east, hospital doctor Noor Wazir said, adding the death toll could rise.
The military has been battling the Pakistani Taliban and their ally, the Lashkar-e-Islam, in Khyber since October last year, with fighting mostly focused on the strategic Tirah Valley.