Brent crude did dip back down to $99.90 a barrel, but any fresh flare-ups in the Middle East could see it pushed higher again.
Tit-for-tat strikes between Iran and the US have escalated in the past week, more than six months after conflict broke out when the US and Israel launched attacks on Iran on 28 February.
Oil prices have fluctuated wildly since the war began, and pressure on the industry has been exacerbated by wider regional instability.
Before the conflict Brent crude had been priced at about $70 (£52) a barrel.
But the war has seen the effective closure of the Strait of Hormuz, which carries 20% of the world’s oil and liquefied natural gas (LNG).
The rising costs have sparked huge price leaps in petrol around the world for motorists at the pumps.
The US strikes on the five Iranian tankers saw four in the Gulf of Oman linked to Iran’s Revolutionary Guards Corps (IRGC) hit as well as another near Kharg Island.
Tehran responded by launching missiles at a US base in Jordan – most of which were shot down – and said it attacked two US vessels and eight oil tankers in the Strait of Hormuz.
The Houthis and Saudi Arabia have also been exchanging strikes since July after their own informal ceasefire unravelled.
On Monday the Houthis accused Saudi Arabia of bombing a prison in al-Hazm and killing 11 people.
Then on Tuesday the Saudi authorities said Houthis had struck civilian and economic sites in the cities of Abha, Khamis Mushait, Jazan and Najran.
The latest round of escalation comes after Iran targeted a US warship with ballistic missiles, which Centcom said were “successfully evaded”. It added that no American troops were harmed during the attacks.
In response, the US said that the five Iranian oil tankers it targeted were “part of a multi-billion-dollar shadow network that funds the IRGC and its regional proxies”.
One of the ships it had struck, the M/T Riesco, sunk in the Gulf of Oman, Centcom later said, posting a video on X of the damaged vessel.
Kharg Island – where one Iranian tanker was attacked in the latest round of US strikes – hosts Iran’s main terminal for exporting oil.
Some 90% of the country’s crude oil passes through the island in the Gulf, transported through pipes from the mainland.
Also on Tuesday, Yemen’s Iran-backed Houthi movement attacked energy facilities and civilian infrastructure in Saudi Arabia, injuring 73 people, according to Saudi authorities.
The drone and missile attack caused fires at oil facilities and installations that led to a temporary halt in operations, Saudi Arabia’s military and energy ministry said.
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