Oil jumped close to $70 a barrel after a U.S. airstrike ordered by President Donald Trump killed a top Iranian general in Iraq, intensifying fears of conflict in the world’s most important crude-producing region.

In a turbulent start to the trading day marked by unusually heavy volumes, futures in London and New York surged by more than 4% to levels not seen since the attacks on Saudi Arabia’s oil production in September. The strike near Baghdad airport killed Qasem Soleimani, the Iranian general who led the Revolutionary Guards’ Quds force, according to a Defense Department statement.

While no oil installations or production were impacted, the killing of one of Iran’s most powerful generals is a provocation that ratchets up tension between Washington and Tehran, heightening fears of an armed confrontation that could pull in other countries. As focus shifts to how Iran will react, the country’s supreme leader, Ayatollah Ali Khamenei, vowed that “severe retaliation” awaits the killers of Soleimani, according to a statement.

This is a seismic event in the region,” said Jason Bordoff, a former Obama administration official who now works for Columbia University. “This is how US-Iran tit-for-tat spirals out of control. Iran’s response will be severe and deadly. And certainly may include escalating attacks on energy infrastructure.”

Crude prices had pared some of their immediate gains by midday in Singapore but remained at the highest levels since September. Brent crude for March settlement was up $1.94, or 2.9%, at $68.19 a barrel on the ICE Futures Europe exchange at 7:11 a.m. in London. It earlier jumped as much as 4.4% to $69.16 a barrel.

In New York, West Texas Intermediate for February delivery was 2.9% higher at $62.93 a barrel. The contract earlier advanced as much as 4.4% to $63.84, exceeding September’s levels to the highest since May. Total aggregate volume for Brent and WTI was about 17 times the 30-day average.

Tensions have been building between Washington and Tehran after an Iran-backed Iraqi militia stormed the American embassy in Baghdad to protest deadly U.S. airstrikes earlier this week. Saudi Arabia’s energy facilities as well as foreign tankers in and around the Persian Gulf have been the target of several attacks over the past year — a region that includes OPEC’s five biggest producers.

The U.S. and Iran are already facing off over Trump’s crippling economic campaign against Tehran and suspected Iranian reprisals. Defense Secretary Mark Esper said on Thursday that America was ready to deploy more force in Iraq after the attack on its embassy.

Soleimani, who led proxy militias that extended Iran’s power across the Middle East, was hit in a U.S. drone strike near Baghdad International Airport, according to a U.S. official. Details remained unclear, but a person familiar with the developments said an Iraqi militia leader, Abu Mahdi al-Muhandis, was also killed.

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