NATO member Romania has found new fragments of a drone deemed similar to those used by the Russian army near its border with war-torn Ukraine, in the third such finding in a week, defense and NATO officials said.

Two helicopters from the Romanian Air Force were deployed with specialist teams to Nufaru and Victoria in the eastern county of Tulcea, where the fragments were spread over “several tens of meters”, the Ministry of National Defense said in a statement.

It said in a separate statement that it has notified the General Inspectorate for Emergency Situations about areas near the border that could be at risk of incidents as Russian forces attack Ukraine’s Danube River ports across the river from Romania.

In a statement, NATO spokesperson Dylan White said that the Romanian ambassador to the alliance updated allies on “Russia’s continued attacks on Ukrainian port infrastructure near Romania”.

He added that “NATO has no information indicating any intentional attack by Russia against Allied territory”.

As a NATO member, Romania is party to NATO’s mutual defence agreement.

Emergency authorities in Romania have received phone calls “about possible cases of drone impacts” between three localities, including Nufaru, the ministry said. It later confirmed that samples collected from the site were similar to those used by the Russian army and that experts are continuing to establish the circumstances of the incident.

The NATO spokesperson said Romania had “informed Allies that fragments of drones similar to those used by Russia have been identified on Romanian territory for a third time”.

After Wednesday’s drone findings, Romania’s Ministry of Foreign Affairs said that it “reiterates its firm protest against the violation, once again, of Romania’s airspace” and that it will summon the head of Russia’s diplomatic mission.

Wednesday’s findings are the third such discovery on Romanian soil since last Thursday. They come during sustained attacks by Russian forces on Ukraine’s Danube ports as Moscow aims to disrupt Ukraine’s ability to export grain to world markets.