By Saeed Azhar and Lananh Nguyen

(Reuters) -Citigroup Inc Chief Executive Officer Jane Fraser expressed confidence in the U.S. banking system after a series of U.S. bank failures rattled investors and fueled turmoil across global financial markets.    The banking sector is “pretty sound,” despite high-profile bank closures, Fraser told the Economic Club of Washington D.C. “This is not a credit crisis,” she said.

The fourth-largest U.S. lender is not interested in buying beleaguered First Republic Bank, Fraser added.

Citi was one of 11 major banks to contribute a combined $30 billion in deposits to First Republic last week to help it buy more time to restructure, she said.

(Reporting by Lananh Nguyen and Saeed Azhar; Editing by Sandra Maler)