Dozens of crew members have been rescued after abandoning two oil tankers hit by explosions in the Gulf of Oman.
Iran said it had rescued the 21 crew members on board the Kokuka Courageous and the 23 on the Front Altair.
The cause of the explosions in one of the world's busiest oil routes remains unclear and both vessels are still afloat.
The incident comes a month after four oil tankers were attacked off the UAE.
The cause has not been confirmed.
The Norwegian-owned Front Altair had been "attacked", the Norwegian Maritime Authority said, leading to three explosions on board.
Wu I-fang, a spokesman for Taiwan's state oil refiner CPC Corp, which chartered the Front Altair, said it was carrying 75,000 tonnes of naphtha and was "suspected of being hit by a torpedo", although this has not been confirmed. Other unverified reports suggested a mine attack.