Cryptocurrency exchange EXMO said an estimated $4 million of the cryptocurrency stolen during a hack on Dec. 21 was through the exchange Poloniex.  

• The U.K.-based platform has estimated that a total of 6% of its cryptocurrency has been lost to the attack with an estimated $4 million being withdrawn through Poloniex. The dollar figure of what was lost overall in the hack wasn't immediately known.
• The exchange said assets cannot be recovered by EXMO due to criminals withdrawing the funds through Poloniex 
• “$1 million in ZEC [zcash] stolen from EXMO have been withdrawn through the Poloniex crypto exchange,” an EXMO spokesperson told CoinDesk Friday.
• On the day of the attack, EXMO said it had contacted cryptocurrency exchange Poloniex with a request to block an associated account and informed London police about the breach.
• EXMO reported losses in six of the 57 cryptocurrencies it supports: ethereum classic. Each digital asset is hosted on its own server, the firm said.
• The platform said it hopes to soon be able to fully reinstate withdrawals and deposit functions on its exchange which has resumed most of its work.
• “We are making some final preparations and checks at the moment before enabling depositing and withdrawing on EXMO. It will soon be ready,” said the EXMO spokesperson. 
• EXMO stressed that those users affected by the incident will be covered by the exchange.
• Poloniex did not immediately respond to a request for comment.

Read more: Crypto Exchange EXMO Says Hackers Have Stolen 5% of Total Assets