No coal operations in the central US – including the hard-hit states of Oklahoma, Iowa, Kansas and Illinois – reported any impacts from the storms or twisters, said US Mine Safety and Health Administration spokeswoman Amy Louviere.

A massive storm system swept over the states Sunday and Monday, doing most damage to the city of Moore in central Oklahoma. A tornado, now classified as an F5, the strongest type, took down entire neighborhoods, a local hospital, two schools and many businesses.

The path of the twister was as wide as two miles in some areas.

At press time, the confirmed death tally from Moore alone was 24, nine of them children. That figure is expected to increase as the cleanup continues.

According to federal data, Oklahoma has one active underground coal mine and five surface operations, as well as one surface operation listed as temporarily idled. All of the mines produce bituminous coal.

The sole underground complex, Calder, is owned by Coal Creek Minerals, while the remaining mines are operated by Farrell-Cooper Mining and Phoenix Mining.

None of the operators provided comment by press time on any specific damage to facilities.