Arnold Schwarzenegger has undergone heart surgery in Los Angeles.

The Austrian-American film star and former California governor, who is 70, had a scheduled procedure to replace a catheter valve on Thursday.

The device was first installed to repair a defective aortic valve in 1997. The latest operation lasted several hours, TMZ website reports.

Schwarzenegger is reported to be in a stable condition and recovering at Cedars-Sinai hospital.

Responding to the news, Austria's Chancellor Sebastian Kurz wished his "friend" well in a tweet, adding: "I look forward to seeing you again."

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