At least two army personnel, including a lieutenant colonel, were killed in a clash with militants in Shawal area of North Waziristan, the Inter-Services Public Relations (ISPR) said on Monday.
Six militants were also killed in the clash, the ISPR statement added.
The final phase of Zarb-e-Azb operation in North Waziristan got underway on Thursday as troops launched a ground offensive in Shawal Valley, one of the last strongholds of militants in the region.
The Zarb-e-Azb operation began in June last year and the army says it has cleared most of North Waziristan.
Shawal Valley and a pocket to its northwest are the remaining areas that need to be cleared.