An anti-explosives robot was deployed to check an object near the south runway. Regional police and prosecutors later said an airport employee discovered a drone near the airport's south runway with “an unknown explosive device,” and the object was examined by police. “Drone sightings, drone threats including in a hybrid context, are something we know from the past,” he added. “That a drone armed with explosives is at an airport is a new threat scenario.” The south runway was scheduled to be out of action for maintenance on Wednesday.