Two Turkish soldiers were killed in an attack by PKK terrorists in southeastern Turkey on Friday night, according to security sources.

Security sources told Anadolu Agency on condition of anonymity due to restrictions of speaking to the media, four soldiers were wounded in the attack on Tekeli military base in Semdinli town of Hakkari province.

The wounded were immediately airlifted to hospital, sources added.

The PKK -- listed as a terrorist organization also by the U.S., and the EU -- resumed its 30-year armed campaign against the Turkish state in July 2015.

Since then, more than 500 security personnel, including troops, police officers, and village guards, have been martyred and over 4,900 PKK terrorists killed in operations across Turkey and northern Iraq.