Oil prices are up swinging wildly as the widening Iran war disrupted tanker traffic through the Strait of Hormuz, highlighting how important the passageway is to the world's oil supply.

Iran-US war latest: Trump demands seven countries help open Strait of Hormuz as Dubai airport hit by fresh attack - The US president said it is only appropriate that those who benefit from oil coming

Iran's threat to close the Strait of Hormuz has halted shipments, raised oil prices and increased risks of global supply delays.

Several U.S. allies rebuffed Donald Trump's call Monday to send warships to escort shipping through the Strait of Hormuz, drawing criticism from the U.S. president, who accused Western partners of ingratitude after decades of support.

The Strait of Hormuz is the narrow mouth of the Persian Gulf through which about a fifth of the world's oil passes. Tankers traveling through the strait, which is bordered in the north by Iran, carry oil and gas from Saudi Arabia, Kuwait, Iraq, Qatar, Bahrain, the UAE and Iran. Most of that oil goes to Asia.

The Strait of Hormuz is the narrow mouth of the Persian Gulf through which about a fifth of the world's oil passes.

The Islamic Republic has vowed to block the region’s oil exports, saying it would not allow “even a single liter” to be shipped to its enemies.