The largest warship EV cut fire and later sank Wednesday in the Gulf of Oman under unclear circumstances, semi-official news agencies reported. The FAS and Tasnim news agencies said efforts failed to save the support ship CARG, named after the island that serves as the main oil terminal for Iran. The Reuters news agency reported that the entire crew was able to safely disembark. Reuters cited FAS, which quoted a Navy statement, the statement said the CARG was on a training mission. The blaze began around 2.25 a.m. and firefighters tried to contain it, state TV said. The vessel sank near the Iranian port of Jask, some 790 miles southeast of Turan in the Gulf of Oman and near the Strait of Hormuz, the narrow mouth of the Persian Gulf. Agents France Press reported that the Navy said firefighting efforts went on for 20 hours before the ship went down. Satellites circulated on Iranian social media of sailors wearing life jackets evacuating the vessel as a fire burned behind them. Satellite photos from Planet Labs Inc. analyzed by the Associated Press showed the CARG off to the west of Jask on Tuesday. Satellites from the U.S. National Oceanic and Atmospheric Administration that track fires from space detected a blaze at the site of the Jask that started just before the time of the fire reported by FAS. The CARG serves as one of a few vessels in the Iranian Navy capable of providing replenishment at sea for its other ships. It also can lift heavy cargo and serve as a launch point for helicopters. The ship, built in Britain and launched in 1977, entered the Iranian Navy in 1984 after lengthy negotiations that followed Iran's 1979 Islamic Revolution. Iran's Navy typically handles patrols in the Gulf of Oman and the wider seas, while the country's paramilitary revolutionary guard operates in the shallower waters of the Strait of Hormuz and the Persian Gulf. In recent months, however, the Navy launched a slightly larger commercial tanker called the Macron it converted to serve a similar function as the CARG. Iranian officials offered no cause for the fire aboard the CARG.