U.S. regulators are looking into whether FTX potentially mishandled customer funds on its platform, sources told Bloomberg.

In addition to the liquidity crisis itself, the U.S. Securities and Exchange Commission (SEC) and the Commodity Futures Trading Commission (CFTC) are investigating FTX’s relationship with its sister entity Alameda Research as well as with FTX US. The investigations, which haven’t been publicly disclosed, began “months ago as a probe into FTX US and its crypto-lending activities,” Bloomberg reported.

Alameda Research, a crypto trading firm run by FTX chief Sam Bankman-Fried, was caught in the eye of the storm this week when its leaked balance sheet financials revealed unusually close ties with FTX through the exchange’s native FTT token. Changpeng Zhao, Binance’s chief executive, sent shockwaves through the cryptoverse when he Tweeted that his firm, an early investor in FTX and a large holder of its tokens, would be liquidating its position in FTT.