Oil prices ticked up in early trading on Wednesday after ending the previous session up more than 4% on worries that the Iran-Israel conflict could disrupt supplies.

The recent military clash between Iran and Israel has sent shockwaves through global energy markets, causing oil prices to spike and raising concerns about inflation and potential disruptions to oil supply routes.

Oil prices resumed their upward climb and U.S. futures were lower early Tuesday after Israel’s military issued an evacuation warning to 330,000 people in Iran’s capital Tehran. Asian shares were mixed.