PARACHINAR, Pakistan - A bomb exploded at a compound in northwest Pakistan on Saturday, killing nine people and wounding 20, local government and intelligence officials said.

The bombing in the compound, used by a local militia and containing residential units and an office, occurred near the village of Spin Tal in the Orakzai tribal region. The Pakistan military has been conducting operations against militant groups in the area for months.

"We are not sure if a suicide bomber hit the compound or if some militants were assembling a bomb and it accidentally went off," a local government official said, requesting anonymity.

The wounded were evacuated to a hospital in neighboring Hangu district. A hospital official told Reuters that several of the wounded were in critical condition.

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