The attack took place when security forces were scanning mines on a highway between Mardin and Diyarbakir provinces, the private Dogan news agency reported.
The explosives had been placed by PKK militants who blew them up when a vehicle loaded with soldiers passed by, Dogan said.
The PKK is proscribed by Ankara, the United States and the European Union as a terror group.
The group has been waging an insurgency against the Turkish state since 1984 during which over 40,000 people have been killed.
Disclaimer: No Business Standard Journalist was involved in creation of this content