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This photo taken on June 20, 2026 shows the Strait of Hormuz near Khasab, a small town in northern Oman. (Xinhua/Wen Xinnian)

The notice also warned mariners of the presence of mines in the area and said naval forces are expected to operate there as mine-clearing activities continue.

LONDON, June 27 (Xinhua) -- The U.S.-led Joint Maritime Information Center (JMIC) on Saturday raised the maritime security threat level in the Strait of Hormuz from moderate to substantial.

The advisory was issued by the United Kingdom Maritime Trade Operations (UKMTO). JMIC is a multinational naval advisory body, and UKMTO serves as one of its core information-sharing partners.

According to the advisory, the threat level was raised following attacks on commercial vessels in waters near the Strait of Hormuz.

The notice also warned mariners of the presence of mines in the area and said naval forces are expected to operate there as mine-clearing activities continue.

This photo taken on June 20, 2026 shows the Strait of Hormuz near Khasab, a small town in northern Oman. (Xinhua/Wen Xinnian)

Shipping through the Strait of Hormuz had gradually resumed after the United States and Iran recently reached a memorandum of understanding, prompting JMIC on June 18 to lower the maritime threat level in nearby waters to moderate.

However, a container ship and an oil tanker were attacked in nearby waters on Thursday and Saturday, respectively.

The U.S. Central Command said on Friday that U.S. forces had struck Iranian targets in response to an attack on a commercial vessel near the Strait of Hormuz a day earlier.

Meanwhile, international shipping data showed that although the attacks have reduced traffic through the waterway, commercial vessels are still transiting the strait.

JMIC also said on Saturday that, to accommodate simultaneous inbound and outbound traffic, the southern shipping lane in the Strait of Hormuz, near the Omani side and supported by the U.S. military, has been widened.

The Navy of Iran's Islamic Revolution Guard Corps on Thursday once again stressed that the only authorized routes for vessels' passage through the strait are the ones announced by Iranian authorities.