Commercial ships came under fire and threats from Iran's military as they tried to cross the Strait of Hormuz on Saturday, security monitors said, as Iran closed the crucial trade route again

The day after Iran declared the vital waterway open, it reversed course, injecting new peril into navigation there.

The Iranian regime said the Strait of Hormuz is under "full IRGC control," reversing course on reopening the strategic waterway crucial to global oil supply.

Iran says it is closing the Strait of Hormuz again to commercial vessels and that any ship that approaches it will be targeted. The closure came as reports emerged of vessels in or near the strait, including a tanker, were targeted by Tehran on Saturday.

Crude oil prices surged Sunday, as the U.S. and Iran teetered on the brink of a renewed war after attacks on commercial ships in the Strait of Hormuz.

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Two IRGC gunboats approached a tanker about 20 nautical miles northeast of the Gulf country around 1 p.m. local time — and opened fire unprovoked, the tanker’s master reported.

Using force against a ship during a blockade is only lawful under certain conditions. A naval expert explains.

Iran’s Revolutionary Guards said they were closing the strait until the U.S. blockade is lifted. Two ships reported being hit as they tried to pass through the strait.

Merchant vessels attempting to cross the strait on Saturday received radio messages from Iran's navy telling them they were not allowed to pass.