Former Secretary of State Henry Kissinger has undergone an aortic valve replacement procedure at a hospital in New York.
New York-Presbyterian Hospital in Manhattan released a statement saying the 91-year-old ex-diplomat was "resting comfortably" following the procedure on Tuesday.
The hospital declined to release any other information. A spokeswoman for Kissinger would not comment.
Last year, Kissinger was admitted to the same hospital after a fall in his home. He was released the same day.
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Kissinger served under presidents Richard Nixon and Gerald Ford. He was awarded the Nobel Peace Prize in 1973 and the Presidential Medal of Freedom in 1977.
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