Also in the northwest, a suicide bomber attempted to attack a security post in the Swat Valley but was killed before he could strike.
The incident showed the region was still dangerous despite the recent arrests of five militant commanders there.
"The bomb in the Mandiknas area of Khyber was targeting a security convoy and was detonated by remote control," said Sadiq Khan, an official at Khyber agency administrator office. Four people were wounded in the blast, he said.
"On Sunday, Sep 13, a suicide bomber attempted to attack a checkpoint close to a fuel station in the region, but security forces fired on his vehicle from a distance and it exploded, killing him," said Maj Mohammad Mushtaq of the Swat media center.