Only five ships, including one Iranian oil products tanker, have passed through the Strait of Hormuz in the past 24 hours, Reuters reports, citing shipping data.

The Iranian-flagged oil products tanker Niki, which is subject to US sanctions, was among the few vessels that sailed out of the strait with no destination listed, Kpler analysis and tracking data on the MarineTraffic platform showed.

It was unclear what would happen if it continued to sail further east towards the blockade line imposed by the US Navy.

Container shipping group Hapag-Lloyd also said that one of its ships has crossed the Strait but did not provide any information on the circumstances or timing. The Comoros-flagged supertanker Helga arrived at an offshore oil loading terminal in Iraq’s southern Basra port, the second vessel to reach Iraq since the strait’s closure.