BUCHAREST, Sept 9 (Reuters) - New fragments of a drone similar to those used by the Russian military were found on Romanian soil, the defence ministry said on Saturday, and President Klaus Iohannis said this indicated an unacceptable breach of Romania's air space had occurred.

"I firmly condemn this incident caused by Russian attacks on Ukrainian Danube river ports."

The attacks on Ukraine's river ports, just hundreds of metres from the Romanian border, have increased security risks for NATO whose members have a mutual defence commitment.

The U.S. State Department said earlier this week it would rotate additional U.S. F-16 fighter jets to bolster NATO's air policing mission in Romania.

The defence ministry said Romania's Naval Forces deployed search teams after local authorities alerted them to suspected drone fragments discovered 2.5 km southeast of the village of Plauru, across the Danube from the Ukrainian port of Izmail.

Since July, when Moscow abandoned a deal that lifted a de facto Russian blockade of Ukraine's Black Sea ports, it has repeatedly struck Ukrainian river ports that lie across the Danube from Romania.

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