Florida officials announced on Sunday that fuel purchased after 10 a.m. on Saturday was likely contaminated with diesel if it was supplied by CITGO from the Port of Tampa.

The Florida Department of Agriculture and Consumer Services (FDACS) made the announcement on social media, saying the contamination was caused by human error.

Gov. Ron DeSantis noted the announcement during a press conference regarding Tropical Storm Idalia, which is barreling toward the U.S. southern coast and could make landfall in Florida.

DeSantis said an investigation into the fuel contamination and how widespread it is, is underway.