Seven PKK terrorists, including several senior members, were killed by Turkish security forces in an anti-terror operation in the southeastern Mardin province, the interior minister said Sunday.

Addressing a rally with opposition Nationalist Movement Party (MHP) members in the northeastern Trabzon province, Süleyman Soylu said that senior PKK members who carried out deadly terror attacks in Turkey had been killed in Mardin's Savur district.

One of the terrorists killed in the operation was likely an Iranian national.

On Saturday, the Turkish General Staff said in a statement that from March 31 to April 6, 36 terrorists were killed in anti-PKK operations in the Turkish provinces of Diyarbakir, Sirnak, Batman, Tunceli, Hakkari, and Kars.

The PKK is listed as a terrorist organization by Turkey, the U.S., and the EU. It has waged a terror campaign against Turkey for more than 30 years, during which more than 40,000 people have been killed.

Since the group resumed its armed campaign in July 2015, more than 1,200 people, including security personnel and civilians, have lost their lives.