A police official in Pakistan has said that a bomb blast targeting refugees registering with the government has killed four people in the northwestern city of Peshawar.

Faisal Mukhtar said the blast on Sunday on a football field also wounded eight people. The explosion happened as officials registered refugees from the nearby Khyber tribal region, Mukhtar added.

Government official Manzoor Khan said the assault appears to be a suicide attack and that police are investigating the attack.

No one immediately claimed responsibility for the blast.

Peshawar sits next to Pakistan's tribal region, which is home to a mix of local Pakistani and al-Qaeda-linked foreign fighters.

Pakistan's local Taliban have been fighting against the state in a bid to overthrow the government and install Islamic law.

Source: AP