Washington, May 9 -- Satellite images revealed a large oil slick off the coast of Iran's Kharg Island, the country's main oil export hub, New York Times reported.

It was not immediately clear what caused the spill located off the island's west coast. It appeared to cover more than 52 square kilometres (20 square miles), according to an estimate by Orbital EOS, which monitors oil spills.

The suspected spill, visible in Copernicus Sentinel-1, Sentinel-2, and Sentinel-3 satellite images taken between May 6 and May 8, shows a grey and white sheen spreading over the sea west of the roughly 8-kilometre-long island. Analysts say the slick appears to cover tens of square kilometres of ocean, it reported.

Leon Moreland of the Conflict and Environ...