The number of vessels transiting through the Strait of Hormuz ticked up the day before, with most of them linked to Iranian trade, before a US blockade took effect, shipping data showed, Reuters reports.

Nine of the 11 vessels that passed through the strait on Tuesday sailed via the Iranian route, ship-tracking data on Kpler showed. Of these, three empty oil tankers one Aframax-sized vessel and two Very Large Crude Carriers entered the strait, the data showed.

Vessels that exited the strait with Iranian exports included one VLCC carrying 2 million barrels of crude, a medium-range tanker with refined products, and two tankers carrying liquefied petroleum gas, according to the data.