The Turkish military had launched the airstrikes on the targets based on its intelligence gathering between 9 p.m. (0600 GMT) and 10 p.m. (0700 GMT).

An ammunition depot and shelters in the Qandil Mountains were hit, killing a number of extremists inside, the source, who spoke anonymously due to restrictions on talking to media, said.

The fighter jets returned to their bases safely, the source added.

Separately, an explosives-laden truck left by two PKK extremists was found in eastern Van province's Ercis district Tuesday, a security source said.

The explosives were later disposed of safely in a rural area near the district.

The two extremists were also later caught, source added.

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

Since then, PKK extremist attacks martyred more than 600 security personnel and also claimed the lives of many civilians, including women and children, while more than 7,000 PKK extremists have been killed in army operations.