Brent crude rises after cargo ship comes under attack in key waterway.

Oil prices have jumped after the United Nations maritime agency called off its planned evacuation of ships stranded around the Strait of Hormuz following an attack on a cargo vessel in the waterway.

Brent crude, the international benchmark, rose as much as 4 percent on Thursday after the International Maritime Organization paused its evacuation plan amid renewed violence in the strait.

Brent futures for August delivery stood at $74.89 per barrel as of 02:00 GMT, after earlier dropping below $72.48, their closing price the day before the United States and Israel launched their war on Iran.

After dropping sharply following the US and Iran’s signing of a memorandum of understanding on ending the war last week, the price of Brent currently stands at about 3 percent above its pre-war level.

Asian markets opened lower on Friday, with key indices in Japan, South Korea, Hong Kong and Taiwan seeing steep losses.

Tokyo’s Nikkei 225 and Seoul’s Kospi both fell more than 3 percent in morning trading, while the Taiex dropped about 1 percent.

In Hong Kong, the Hang Seng Index was down about 1 percent.

The latest attack in the strait, through which about one-fifth of global oil and liquified natural gas supplies transit in peacetime, dealt a blow to hopes for a return to normal shipping in the region after a recent resurgence in traffic.

On Wednesday, 70 vessels transited the waterway, a more than twofold increase from the previous day and the highest daily figure since March 1, according to ship tracking platforms MarineTraffic and Kpler.

The United Kingdom Maritime Trade Operations (UKMTO) centre said on Thursday that a cargo vessel reported being struck by an “unknown projectile” on its starboard side while attempting to cross the strait near the Omani coast.

Multiple media outlets, including The New York Times, CBS News and the Reuters news agency, cited unnamed US officials as saying the attack had been carried out by Iran.

Iran’s Persian Gulf Strait Authority, which claims the right to regulate shipping in the strait, said after the attack that any vessel attempting to use routes outside its designated “framework” would not be guaranteed safe passage.

“The consequences arising from passage through unauthorized routes shall be the responsibility of the owner, operator, and vessel commander,” the authority said on X.

June Goh, a senior oil market analyst at Sparta in Singapore, said the attack was a reminder to markets of the fragility of peace in the strait amid the tenuous US-Iran ceasefire.

“There is a pressing need for tankers to enter and offload the high crude stocks from onshore tanks in order for normal production to resume again,” Goh told Al Jazeera.

“Thus, security of the passageway is paramount to recover the lost supply.”