Over the past several days, multiple pilots have reported near-collisions with unidentified objects in the skies above Turkey’s capital.

The incidents, which have primarily occurred near Sabiha Gökçen Airport, have triggered traffic collision avoidance system (TCAS) warnings, though no physical objects have been located.

“On final approach at 300 feet, we received a traffic alert,” one pilot was recorded saying. “It could be a drone or another aircraft. For your information.”

The control tower’s response suggested that the issue was ongoing.

“Sir, we have been dealing with this for the past two and a half hours,” the controller replied. “Several flights before you also received this warning. We have reported it to coastal authorities.”

The pilot then described another anomaly. “We see descending traffic 500 feet below us,” he said. “It appears as an unidentified traffic on our system. It is now 5 miles ahead of us. We also received this warning on our previous flight.”

Despite multiple search efforts, no definitive explanation has been found.

The unexplained encounters have drawn comparisons to reports of unidentified drones near U.S. military bases in recent months. Earlier this week, the Trump administration dismissed concerns over drone activity in New Jersey, but that explanation does not account for similar sightings elsewhere—including those in international airspace.

The UAP triggering collision warnings over Istanbul remain unidentified.