A marine drone of the type used in the war in neighboring Ukraine self-detonated on Friday in Romania’s Black Sea port of Constanta near an oil terminal, without causing any casualties, the Defense Ministry said.

The port was ⁠being evacuated, residents along ⁠Romania’s Black Sea coast were warned to take cover, and two helicopters were surveying ​the area for any ⁠further drones, Deputy Interior Minister Raed Arafat said.

“We now know there is ⁠the risk of ‌self-detonation, we ⁠have … evacuated in case there are more drones,” Arafat said. “We are not panicking, ​the measures are purely preventative.”

The explosion comes ‌a week after a Russian drone crashed into an apartment building in the southeastern Romanian city of Galati, near the ​border with Ukraine, injuring two people – the first time in the Russia-Ukraine war that a drone ‌struck ​a densely populated area in a NATO state.

Romania, a NATO and European Union member, ⁠shares a 650-km (400-mile) border ‌with Ukraine and has reported 28 ​incursions into its airspace by Russian drones since Moscow ‌began attacking Ukrainian ⁠ports ⁠on the Danube, the ​Defense Ministry has said.