According to ChainCatcher, Bloomberg reported that Binance admitted that it mistakenly stored part of its B-Token (Binance-peg token) reserves in the same wallet (labeled "Binance 8") as customer funds.

A Binance spokesperson responded that Binance is aware of the error and is moving these assets to a dedicated collateral wallet. In addition, all customer assets are still backed 1:1. This incident was due to Binance's past operational negligence. (Source link)