Oil prices jumped more than $3 on Friday after a U.S. airstrike in Baghdad ordered by President Donald Trump killed the head of Iran’s elite Quds Force, sparking concerns for an escalation of regional tensions and disruption to crude supplies.

Brent crude rose as high as $69.50 a barrel, its highest since mid-September when Saudi oil facilities were attacked, and was up 4.2% or $2.83 a barrel at $69.08 by 1058 GMT.

West Texas Intermediate (WTI) crude was up $2.53 or 4.1% at $63.71 a barrel, having earlier spiked to $64.09 a barrel, its highest since April 2019.

An airstrike at the Baghdad Airport early on Friday killed Major-General Qassem Soleimani, the architect of Iran’s spreading military influence in the Middle East and a hero among many Iranians and Shi’ites in the region.

Iran’s Supreme Leader Ayatollah Ali Khamenei said harsh revenge awaited the “criminals” who killed Soleimani.

“We expect moderate to low-level clashes to last for at least a month and likely be confined to Iraq,” Eurasia’s Iran analyst Henry Rome said.

Read more: Reuters