This satellite image obtained from Copernicus Sentinel Data 2026 on Sept. 10, 2026, and taken on Sept. 9, 2026, shows a general view of traces of possible oil leaks about 20 km off the Iran's coast in the Gulf of Oman, according to an AFP analysis confirmed by experts. Two of these slicks appear to originate from the locations where Iranian tankers M/T Riesco and M/T Kylo transmitted their last signals before being sunk on Sept. 8 and 5, respectively. (Photo by 2026 Copernicus Sentinel Data/AFP)
Recent satellite images analyzed on Thursday appear to show oil slicks near the Strait of Hormuz, after U.S. strikes on tankers suspected of links to Iran's Revolutionary Guard Corps (IRGC).
An image from the European Copernicus program taken on Wednesday shows brownish streaks on the surface of the water some 20 kilometers off the Iranian coast, to the east of the strait.
Another Copernicus image of the same location taken on Thursday shows winding streaks of a similar length.
Several researchers and experts told AFP they were most likely oil slicks, in an area near coral reefs listed under the Ramsar Convention as wetlands of international importance.
Satellite images alone are not enough to determine the presence of hydrocarbons with certainty nor their precise origin.
But Vincent Kerbaol, head of satellite maritime surveillance operations at the French company CLS, said they were "strong indications" of "pollution probably left by ships."
Leon Moreland, a researcher at the UK-based Conflict and Environment Observatory NGO, also said the images were "highly likely oil slicks, owing to their visual appearance, morphology/spread and absence of evidence for phytoplankton/algal blooms."
SkyTruth, a U.S. non-profit that conducts environmental surveillance, equally came to the same conclusion.
Kerbaol said that if they were fuels with "a certain volatility," the slicks "could evaporate in three to four days, unlike crude oil, which is more long-lasting.
Two of the detected tracks start exactly where the tankers Riesco and Kylo transmitted their last signals before being sunk on Sept. 8 and 5 respectively.
The U.S. military claimed that it had destroyed five tankers in the Gulf of Oman on Tuesday in response to ballistic missile attacks by the IRGC against a U.S. warship.
The 240-meter-long Riesco sank after catching fire, according to images published by the U.S. military on X.
"Based on the location and timing, Riesco seems like a probable candidate," said Moreland.
The last available signal from the vessel on the MarineTraffic site dates from 10 p.m. GMT on Tuesday, precisely at one end of the slick closest to the coast.