Author Stephen King is walking back a tweet in which he said a train crash that involved Republican lawmakers was “karma.”

“Of COURSE sorry the truck driver died,” King said after some pointed out his original tweet was insensitive.

Hours later, he apologized, calling it a “rather thoughtless tweet.”

“I apologize (if one is necessary),” he wrote, also pointing out that Republican lawmakers with experience in the medical field helped those who were injured.

A train carrying Republican lawmakers crashed Wednesday as they were on their way to a retreat in West Virginia. The train hit a truck, leaving one person dead.