Three ships were intercepted as they passed through the Strait of Hormuz, as tensions over maritime security in the region remain high.
According to MarineTraffic data, many ships passing through the area, faced with Iranian threats to shipping, are turning off their AIS tracking devices to make them harder to detect. However, some ships have kept their transmitters active, suggesting their operators are more confident they won't be hit.
On Monday, three ships made the trip with their AIS on. The data shows they sailed close to each other and followed a less-used route, closer to the Iranian coast than usual.
The identified ships are the liquefied petroleum gas tankers Pine Gas and Jag Vasant, both Indian-owned, as well as the Chinese-owned chemical tanker Bright Gold.
A BBC Verify graphic shows the course of these three ships as they passed through the Strait of Hormuz on Monday.
Former US Navy Captain Bradley Martin, now a senior fellow at the US think tank RAND Corporation, said the ships may have been following a route set by Iran. He said such a corridor could be intended to provide safer passage in the event that mines are placed in the strait.
Sic kane thene rregjimtaret e Iranit,lejohen te kalojne pa probleme anijet e vendeve MIKE.