Dallas ? A charter bus company involved in a deadly crash in Arkansas last month must immediately shut down because it is an “imminent hazard to public safety,” federal officials said Thursday.

A Tornado Bus Co. bus carrying 47 people from Chicago to Dallas crashed along Interstate 40 near Forrest City, Ark., on Nov. 25, killing three people aboard and the driver of a pickup truck that was struck.

Dallas-based Tornado’s “motor carrier operation poses an imminent hazard to public safety,” according to a Dec. 21 order from the Federal Motor Carrier Safety Administration.

The company’s numerous violations “substantially increase the likelihood of serious injury or death to Tornado’s drivers, passengers and to the motoring public,” the order said.

The order said Tornado needs to cease all operations because, among other reasons, its practice of permitting drivers to exceed mandated maximum hours of service.

Officials at Tornado did not immediately respond to a phone message seeking comment.