Ship-tracking data shows the number of vessels passing through the Strait of Hormuz increased on Tuesday, and most of them were trading with the Islamic Republic.

Reuters wrote that the move was carried out just before the U.S. naval blockade began.

Kpler Institute data shows that of the 11 ships that transited the strait on Tuesday, 9 passed along routes linked to the Islamic Republic.

CNN also, citing the Windward Institute, wrote that 23 Islamic Republic ships operating in the Strait of Hormuz do so with fake flags, with receivers turned off, or through other methods of concealment, and that seven supertankers carrying crude oil have remained idle in the Indian Ocean.

Traffic through the Strait of Hormuz remained sluggish on Wednesday, hours after the start of the U.S. naval blockade on shipping of the Islamic Republic, and only a small number of ships dared to cross.

According to Bloomberg, based on tracking data, a Greek Suezmax oil tanker carrying Saudi oil reappeared near Fujairah after three days of signal loss.