Another soldier was wounded by the explosion near an army vehicle in Dogar village in the Kurram tribal area, said Javed Khan, a local administrator. No one has claimed responsibility.
The Pakistani Taliban often attack soldiers deployed in the tribal region to fight local militants and their foreign allies. The group has waged a bloody insurgency in the country in recent years that has killed thousands of soldiers.
Also Monday, a bomb planted outside a shop in the southern port city of Karachi killed two people, police officer Raja Umer Khitab said. There was no claim of responsibility.
Karachi has a long history of political, sectarian and ethnic violence.
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Associated Press writer Adil Jawad contributed to this report from Karachi, Pakistan.
