Lines of panicked drivers overwhelmed gas stations in the Southeast on Tuesday, as rising prices fed fears of shortages in the aftermath of a ransomware attack that forced the nation’s largest fuel pipeline offline.

In Washington, Energy Secretary Jennifer Granholm said that the region can expect a “crunch” that will take several days to alleviate.

“We have gasoline,” she said during a White House briefing. “We just have to get it to the right places. And that’s why I think the next couple of days will be challenging.”