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.
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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