A source in Ukrainian intelligence told Reuters on Saturday that "the Russian oil tanker that was attacked in the Black Sea was targeted by a Ukrainian drone boat carrying 450 kilograms of explosives, and it was attacked while transporting fuel for the Russian military." The source noted that "the tanker was well-loaded with fuel, so the fireworks could be seen from afar." He added, "The attack on the C.I.G. tanker was a joint operation by the Ukrainian Security Service and Navy, carried out in Ukrainian territorial waters."