ISTANBUL—Terrorists from the outlawed Kurdistan Workers Party (PKK) have executed 13 kidnapped Turks, including military and police personnel, in a cave in northern Iraq, Turkish officials said on Sunday, amid a military operation against the group. Forty eight PKK terrorists were killed during the military operation, while three Turkish soldiers were killed and three wounded, Defence Minister Hulusi Akar said in a statement. Twelve of the kidnapped Turks had been shot in the head and one in the shoulder, he said. Turkey launched the military operation against the PKK in northern Iraq’s Gara region, some 35 km (22 miles) south of the Turkish border, on Feb. 10 to secure its frontier and find citizens who had been kidnapped previously, he said. The governor of Malatya province in southeast Turkey named six soldiers and two police officers, kidnapped in separate incidents in 2015 and 2016, as being among those killed in …