Four Afghan Army soldiers were killed when their vehicle hit a roadside bomb in the Nawa district of southern Helmand Province.
Provincial government spokesman Omar Zwak told RFE/RL's Radio Free Afghanistan that the incident happened on October 2 when the soldiers were on patrol in the volatile area.
At least two more soldiers were wounded in the blast, which also destroyed their vehicle.
No group has claimed responsibility for the attack. Taliban militants have a strong presence in Helmand.
Officials say Afghan troops recently launched a major military operation against militants in Helmand's Sangin district.
That operation is still under way.
With additional reporting from AP