According to ship-tracking data, six US-sanctioned supertankers with a carrying capacity of 12 million barrels of crude combined have crossed the Strait of Hormuz into the Gulf of Oman over the past week while keeping their transponders switched off.

Iran rejects any US control of strait as both sides trade attacks in major threat to negotiations to end war.

Bahrain, Qatar and the United Arab Emirates all sounded the alarm early in the morning as missiles streaked across the sky and explosions rang out.

The U.S. will resume its blockade of Iranian ports, coasts and ships, according to a Monday announcement from U.S. Central Command, signaling an end to the 60-day ceasefire between Iran and Washington.

Over 8 million barrels of oil moved through the Strait of Hormuz under US military assistance as falling shipping traffic, rising oil prices and fresh attacks heightened concerns over the key energy corridor.

Iran has continued moving sanctioned oil tankers through Hormuz with transponders switched off, even as the US prepares to reimpose a blockade and tensions in the strategic waterway intensify

US-Iran news LIVE: US forces carried out fresh strikes on military targets across Iran, including Bushehr and Bandar Abbas. It was the third straight night of attacks. Iran's IRGC claimed it retaliated with missile and drone strikes on the US Al Juffair base in Bahrain.

Trump says the US will become the "guardian" of the Strait of Hormuz and will charge ships for using it. Iran earlier warned the US not to "interfere" in the strait's "management".