Strait of Hormuz Traffic Plummets as Only 279 Vessels Pass Since War, 22 Attacked – US Blockade Fuels Oil Surge

On Tuesday, shipping data from LSEG and Kpler confirmed that at least three tankers entered the Gulf via the Strait of Hormuz, including the Panama‑flagged Peace Gulf, which is bound for Hamriyah port in the United Arab Emirates. Earlier that day, two U.S.–sanctioned vessels, the Rich Starry and the Elpis, also transited the waterway. Because none of these ships were destined for Iranian ports, they remain exempt from the U.S. blockade that began on Monday.

The U.S. Central Command (CENTCOM) announced that, as of 10 a.m. ET (14:00 GMT) on Monday, a naval blockade was in effect against all maritime traffic to and from Iranian ports, in line with the presidential order issued by former President Trump. The directive applies to "vessels of all nations" operating in Iranian coastal waters, including the Arabian Gulf and the Gulf of Oman.

Tehran has warned of possible retaliation against ports in neighboring Gulf states. In response to the blockade, the Islamic Revolutionary Guard Corps (IRGC) ordered every ship to follow a newly‑drawn navigation map that forces vessels to enter the strait north of Larak Island and exit south of it, citing the risk of anti‑ship mines in the former main traffic zone.

Before the conflict, the strait functioned like a divided highway with two dedicated lanes—each about 3.2 km long—carrying roughly one‑fifth of the world’s oil and gas shipments. The IRGC now classifies the original lanes as "restricted" and has effectively closed them.

Ship traffic has collapsed by **more than 95 %** since the war began. Kpler’s tracking data shows that only **279 vessels** passed through the strait between Feb. 28 and Apr. 12, a stark contrast to the pre‑war average of around **100 ships per day**. Even after a cease‑fire took effect on Apr. 8, a mere **45 ships** have entered or exited the waterway.

The disruption has left hundreds of tankers and other vessels stranded in the Gulf, slashing global oil and gas supplies by an estimated **20 %**—the largest fuel‑supply shock on record. Damage to Gulf energy infrastructure and the sharp reduction in shipments have pushed crude prices up by roughly **50 %**, with Asian importers bearing the brunt of the price spike.

According to the same Kpler data, **22 ships** have been attacked in the Strait of Hormuz since the conflict started. The incidents are distributed as follows: eight in United Arab Emirates waters, six in Omani waters, two each in Iraqi and Qatari waters, and one each in Bahraini, Kuwaiti, Saudi and Iranian waters.

These figures underscore the strategic vulnerability of the world’s most critical energy chokepoint and highlight how the combined effect of the U.S. naval blockade and Iran’s alternate routing has reshaped global shipping patterns and commodity markets.