A Romanian oil company claims that one of its rigs, stationed in the Gulf, has come under fire from Iranian troops.
A spokesman for the firm, GSP, said Iranian troops had seized the rig after firing from a nearby ship, and the company had lost contact with its 26 workers there.
The shooting reportedly happened as the rig was being taken outside Iranian waters for a mandatory overhaul.
GSP has been involved in a legal battle in Iran regarding another rig it has in the Gulf.