According to preliminary data from some media sources, the tankers were attacked by boats equipped with explosives. It is believed that this attack was organized by Iran, after which the operation of Iraqi oil terminals was suspended.

Photo from bbc.com.
Against the backdrop of this incident, on the morning of March 12, oil prices on the stock markets rose again to $100 per barrel, despite the International Energy Agency's decision to release 400 million barrels of oil from reserves.
The Iranian Revolutionary Guard Corps (IRGC) stated, as reported by BBC News, that "artificially restraining the rise in oil prices is impossible," and warned of the need to prepare for prices to reach "$200 per barrel."