An Iranian-owned oil tanker was struck by two missiles off the Saudi port of Jeddah on Friday, Iranian state television reported, quoting the National Iranian Oil Company (NIOC) which owns the vessel.
The tanker was set ablaze and suffered heavy damage and was leaking crude about 60 miles (96 km) from Jeddah, according to Iranian media.
The alleged attack is the latest incident involving oil tankers in the Red Sea and Gulf region, and is likely to ratchet up tensions between Iran and Saudi Arabia.
The U.S. Navy's Fifth Fleet, which operates in the region, said it was aware of media reports about the tanker, but did not have any further information at this time.
There was no immediate comment from Saudi Arabia.
Iran's ISNA news agency cited a source saying the vessel was struck in a “terrorist” attack. Iran's state television reported that two of its tanks were damaged.
Tensions are already high in the Red Sea shipping area, which links the Indian Ocean with the Mediterranean via the Suez Canal.
It follows strikes on key Saudi oil installations in September and attacks on tankers in the Gulf area in May and June. The United States has blamed Iran, which denied any role.
Oil prices jumped 2% after reports of the tanker explosion, with benchmark Brent and U.S. West Texas Intermediate crude futures rising more than $1 a barrel.
A NIOC statement, carried by Iranian media, identified the ship as Sabiti, a Suezmax vessel, after initial reports had identified it as the Sinopa, another Suezmax ship.
Refinitiv ship tracking data gave the Sabiti's last reported position on Aug. 14 as off the southern coast of Iran in the Gulf. It said the Sinopa was in the Red Sea, according the latest data updated on Oct. 10.
Iran's Nour news agency, which is close to the Iranian Revolutionary Guard Corps, said the crew was safe.
The Sept. 14 attacks on Saudi oil sites in the east of the kingdom shut down 5.7 million barrels per day (bpd) of production, about half of Saudi output and roughly 5% of global supply. Output has since been restored.
Yemens Iran-aligned Houthi group claimed responsibility for those attacks, but a U.S. official said they originated from southwestern Iran. Riyadh blamed Tehran. Iran denied any role.