ANKARA: Sirens were heard early on Friday at Turkiye’s Incirlik air base, a key NATO facility where US troops are stationed near the southeastern city of Adana, state news agency Anadolu reported. There was no immediate official comment on the incident, which took place four days after NATO air defenses shot down a ballistic missile in Turkish airspace that was fired from Iran, the second in five days. Residents of Adana, which lies 10 kilometers away from the base, were woken at around 3:25 a.m.