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|An oil tanker off the coast of the Gulf emirate of Fujairah. (Photo: AFP/Karim Sahib)|
Iran's media reported that the country's navy rescued 44 crew members from the tankers, saying they caught on fire after an "accident".
However the US Fifth Fleet said it had received two distress calls after a "reported attack on tankers" in the Gulf.
A merchant shipping information service run by Britain's Royal Navy meanwhile reported an "incident".
"UK and its partners are currently investigating," the United Kingdom Marine Trade Operations (UKMTO) said on its website, without giving further details.
In early morning deals in London, the price of Brent North Sea crude oil rose as high as $62.64 per barrel. It later stood at US$61.41, up US$1.44 from Wednesday's closing level.