German counterterrorism authorities are leading an investigation into an explosive-laden drone that was found overnight at Leipzig airport.

An airport worker discovered the drone carrying an explosive device in a restricted cargo area late Tuesday, according to Dresden Public Prosecutor’s office and Saxony state police. A police bomb disposal robot examined the drone before officers disarmed the device by removing its detonator.

Airport officials temporarily suspended flights and diverted several aircraft. One of the diverted planes, a DHL cargo aircraft, struck another flying object while climbing away from the airport. After landing at Hanover airport, officials found signs of an impact on the aircraft’s nose.