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Ships were largely avoiding the Strait of Hormuz on Monday after an escalation at the weekend in which Iran fired what appeared to be warning shots at vessels and the U.S. military seized an Iranian cargo ship. Just one ship ‌exited the Gulf ⁠through the ⁠strait while two entered in the space of 12 hours, ship-tracking data showed on Monday, a fraction of what is usually about 130 vessels per day.

The oil products ​tanker Nero, which is under British sanctions for Russia-related activities, was sailing through the strait, satellite analysis from SynMax and tracking data from the Kpler platform ​showed. Two other ships – the chemical tanker Starway and Axon I, a liquefied petroleum gas tanker under U.S. sanctions for past trading with Iran- were sailing into the Gulf.

More than a dozen tankers passed through the strait after Iran briefly declared it open on Friday. But ​a ceasefire between the United States and Iran appeared in jeopardy on Monday as Iran vowed ⁠to retaliate ‌for the U.S. seizure of its vessel and refused to join new peace talks.