Flight operations on the northern runway at Germany's Leipzig/Halle Airport remained suspended on Thursday, after the discovery of an explosives-laden drone at the airport raised major security concerns.
Flights were operating via the airport's southern runway, which had been closed briefly on Wednesday while authorities dealt with the incident.
The drone carrying an explosive device was found late Tuesday near a Ukrainian Antonov An-124 cargo aircraft, security sources said. Specialists from Germany's federal police later defused the device.
Investigators were also continuing their search for a separate unidentified flying object that apparently collided with a DHL cargo aircraft after the plane aborted its landing in Leipzig due to the runways being closed over the first incident.
That aircraft was then diverted and landed safely in Hanover, where inspectors found minor damage, authorities said. Law enforcement said the search for the unidentified object would continue on Thursday.
Prosecutors said they would not comment on the explosives-laden drone, the investigation into the damaged DHL cargo aircraft or whether Germany's federal prosecutor would take over the case. The federal prosecutor is responsible for cases involving offences such as terrorism and espionage.
German Interior Minister Alexander Dobrindt described the incident as a "hybrid attack scenario."
Without naming any suspects, he said late Wednesday that it appeared to be part of a broader effort that could involve "foreign powers" seeking to sow uncertainty in Germany.