Brazilian cryptocurrency exchange Mercado Bitcoin identified and contained a security breach in one of its systems

From the articleMercado Bitcoin Says It Will Absorb $40 Million Loss From HackAlso in Mercado Bitcoin hack losses are at $46M and growing, Mercado bitcoin hit by $40 million hack across 10 blockchains, Brazil’s Largest Crypto Exchange Mercado Bitcoin Hit by Possible $40M Hack, Ripple Partner Mercado Suspends Withdrawals After Confirming 'Security Incident' - U.Today, Brazil's Largest Exchange Mercado Bitcoin Halts Withdrawals After $40 Million Hack - Decrypt