The army said that militants opened indiscriminate fire on a newly-established army post in Rajgal Valley of Khyber Agency and killed one soldier.
The troops retaliated and killed five terrorists and injured four others, the army's media wing Inter-Services Public Relations said in a statement.
The army has launched a military operation 'Khyber-4' under 'Radd-ul-Fasaad', which roughly translates to 'elimination of discord', to eliminate terrorists and consolidate gains of counter-terrorism operations in the country's restive northwest tribal region.