WASHINGTON, Aug 14 (Reuters) - A powerful U.S. committee that scrutinizes foreign investments for national security threats fined T-Mobile $60 million for failing to prevent and report unauthorized access to sensitive data, senior U.S. officials said on Wednesday.

The penalty, which represents the heftiest fine ever imposed by the Committee on Foreign Investment in the United States, is tied to violations of a mitigation agreement T-Mobile entered into with the panel when it bought Sprint Corp for $23 billion in 2020, the officials said. (Reporting by Alexandra Alper; Editing by Eric Beech)