Germany and Denmark are the latest countries to raise the alarm over drone sightings and unexplained drone activity.

Danish Prime Minister Mette Frederiksen said Tuesday that she considered the initial drone intrusions over Copenhagen and elsewhere to be "a serious attack against critical infrastructure in Denmark."

Officials in Europe have been on high alert after drone incursions in Denmark shut down air traffic several times over the past week.

When a store’s security team spots shoplifters leaving the scene, they can activate the drone, which is docked on the roof. Equipped with video and thermal cameras, the drone can track thieves escaping on foot or in a vehicle. Its video feed can then be sent to the company’s security team and transmitted directly to local police.

The vessel had its tracking equipment deactivated, indicating the vessel wished to avoid detection by Danish authorities.

The Danish defense ministry said Saturday that "drones have been observed at several of Danish defense facilities" overnight Friday into Saturday. The renewed drone sightings come after there were several drone sightings in the Nordic country earlier this week, with some of them temporarily shutting down Danish airports.

Banning Chinese-made DJI drones due to national security concerns has long been a priority of U.S. Rep. Elise Stefanik.

Turkish drones and a frigate are tracking the Global Sumud flotilla near Crete as it heads toward Gaza, with Italy, Spain, and Greece also monitoring. According to flight tracking websites and open source commentators,