The gunfight erupted after militants attacked Ghundi checkpoint in the tribal district bordering Afghanistan, officials said.
The district is a gateway for Nato supplies to Afghanistan.
"A group of about 30 militants attacked the Ghundi checkpost early Sunday, but security forces had prior information about it and were well prepared," a senior security official told AFP on condition of anonymity.
"At least six militants were killed in the gunfight and the attacking militants were forced to flee," the official said, adding there no casualties among security forces.
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