An animal rescue group said 61 dead cetaceans - an order of aquatic mammals that includes whales and dolphins - had been recorded since the oil spill.

More than 30 dead dolphins have been found in the sea following an oil spill caused by the wreck of two tankers during a storm last month in the Kerch Strait, according to the dolphin rescue center Delpha,

Thirty-two dolphins have died following a fuel oil spill from storm-struck tankers in the Kerch Strait, separating Crimea from Russia's Krasnodar region. Animal rescue groups attribute the deaths to the spill,