A Turkish F-16 fighter jet takes off from Incirlik airbase in the southern city of Adana, Turkey, July 27, 2015.

Turkish warplanes struck Kurdistan Workers Party (PKK) targets in northern Iraq and killed 24 PKK fighters in southeast Turkey on Thursday, the army said, as the militants launched a car bomb attack on a military installation in the region.

Thursday night’s bombing killed three security force members and wounded 24 at a security outpost near the southeast’s largest city of Diyarbakir, the military said in a separate statement on Friday, confirming a report from security sources.

A Reuters witness said the installation suffered severe damage in the blast on the highway between Diyarbakir and the town of Lice. Security forces imposed tight security in the area and erected screens to conceal the site.

The army says more than a thousand insurgents have been killed in the largely Kurdish southeast since a 2-1/2-year-old PKK ceasefire collapsed in July, triggering the heaviest clashes in the region since the 1990s.

In the latest in a series of air strikes in northern Iraq, Turkish F-16 and F-4 jets destroyed PKK ammunition depots and shelters in the Avasin and Basyan areas on Thursday afternoon, the military said.

Security forces also killed 24 PKK fighters on Thursday in the towns of Nusaybin, Sirnak and Yuksekova in southeast Turkey, near the borders with Syria, Iraq and Iran, it said.

President Tayyip Erdogan has said that more than 300 members of the security forces have died, while the pro-Kurdish opposition says hundreds of civilians have also been killed in the military operations which were stepped up in December.

More than 40,000 people have been killed in the conflict since the PKK launched its insurgency in 1984. The PKK, which says it is fighting for Kurdish autonomy, is designated as a terrorist group by Turkey, the United States and European Union.

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