Turkey struck suspected Kurdish militant targets in Syria and Iraq for a second day on Thursday following an attack on the premises of a key defense company which killed at least five people, the state-run news agency reported.

The National Intelligence Organization targeted numerous “strategic locations” used by the Kurdistan Workers’ Party, PKK, or by Syrian Kurdish militia that are affiliated with the militants, the Anadolu Agency reported. The targets included military, intelligence, energy and infrastructure facilities and ammunition depots, the report said. A security official said armed drones were used in Thursday’s strikes.

On Wednesday, Turkey’s air force carried out airstrikes against similar targets in northern Syria and northern Iraq, hours after government officials blamed the deadly attack at the headquarters of the aerospace and defense company TUSAS, on the PKK.

Defense Minister Yasar Guler said Thursday that 47 alleged PKK targets were destroyed in Wednesday’s airstrikes — 29 in Iraq and 18 in Syria.

“Our noble nation should rest assured that we will continue with increasing determination our struggle to eliminate the evil forces that threaten the security and peace of our country and people, until the last terrorist disappears from this geography,” Guler said.

The assailants — a man and a woman — arrived at the TUSAS premises in the outskirts of Ankara in a taxi they commandeered after killing its driver, reports said. Armed with assault riffles, they set off explosives and opened fire, killing four people at TUSAS, including a security personnel and a mechanical engineer.

Security teams were dispatched as soon as the attack started at around 3:30 pm, the interior minister said. The two assailants were also killed and more than 20 people were injured in the attack.

There was no immediate statement from the PKK on the attack or the Turkish airstrikes. In Syria, the main U.S.-backed force said Turkish strikes in the north of the country killed 12 civilians and wounded 25.

The Kurdish-led Syrian Democratic Forces said Turkish warplanes and drones struck bakeries, power stations, oil facilities and local police checkpoints.

TUSAS designs, manufactures and assembles civilian and military aircraft, unmanned aerial vehicles and other defense industry and space systems. Its defense systems have been credited as key to Turkey gaining an upper hand in its fight against Kurdish militants.