The Shoja 2 ship - an Iranian-flagged cargo ship, passed through the Strait of Hormuz and moved into the Gulf of Oman but has now stopped sending positional signals.
The ship's journey is being closely monitored after the US Navy seized another Iranian cargo ship on April 19 - the first seizure since Washington blockaded this waterway route last week.
The other two ships have no clear contact with Iran. The Lian Star - a Gambia-flagged cargo ship - has crossed the strait and is heading south, entering the Gulf of Oman.
Meanwhile, the Ean Spir - an unclaimed medium-sized oil tanker showing its destination is Shinas, Oman. The Ean Spir began its journey northeast from the waters near Ras Al-Khaimah in the United Arab Emirates and is south of Larak Island.
In general, traffic through the strategic sea route of Hormuz is almost stagnant after a chaotic weekend, when Iran announced the opening of the strait and then closed it again after the US refused to lift the blockade. About 800 ships are still trapped in the Persian Gulf.
On April 20, US President Donald Trump said that the US blockade will continue to be maintained at the present time. The US leader also said that the 2-week ceasefire agreement with Iran, which will expire on the evening of April 22 Washington time, is unlikely to be extended. Negotiations between the US and Iran are scheduled to take place in Pakistan.
Traffic through the Strait of Hormuz has remained unpredictable since the ceasefire took effect. At least 3 container ships of the Mediterranean Shipping Company along with 1 tourist ship of MSC and several other passenger ships, are believed to have left the Persian Gulf on April 18, moving close to the coast of Oman.
On April 20, 2 ships carrying liquefied petroleum gas related to Iran and 2 ships carrying petroleum products, including 1 ship related to Iran, passed through the Strait of Hormuz in both directions.
According to the Equasis database, the Lian Star ship is recorded to be owned and managed by Mashini S - a company based in Dubai without detailed contact information.
Meanwhile, the Ean Spir did not appear on any country's sanctions list, and Equasis noted that the ship had an unidentified flag - a common tactic of ships belonging to the "dark fleet".
