U.S. bank regulators contacted banks this week to check whether their systems had any vulnerabilities after last week’s $6.3 billion hack of Binance, Reuters reported Thursday, citing several people familiar with the matter.

Supervisors from the Federal Reserve and the Office of the Comptroller of the Currency began reaching out to banks on Monday morning, asking about any unusual activity or disruption in their services.

The outreach shows regulators are treating the largest crypto theft on record as a possible risk to traditional finance, not just a problem for crypto exchanges, at a time when links between banks and the crypto industry have tightened.

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