(CNN) Kiefer Sutherland suffered a serious injury that has caused him to cancel the remaining three stops on his European tour, the actor and singer announced on social media.

Sutherland said in an Instagram post on Thursday that he slipped on the steps of his tour bus, injuring a rib, "making it difficult to breathe and impossible to sing."

The accident occurred while traveling to Denmark, Sutherland said.

"I am so sorry for any inconvenience that that I have caused to the fans who have bought tickets," Sutherland said. "I will do everything I can to make it up to you."

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