Two more bitcoin exchanges including Flexcoin and Poloniex have been hacked, with the Flexcoin closing all its services.
Flexcoin lost 896 bitcoins from its hot wallets worth £365,000.
Flexcoin said in a statement that on 02 March 2014 the bitcoin bank was attacked and robbed of all coins from the hot wallet.
"As Flexcoin does not have the resources, assets, or otherwise to come back from this loss, we are closing our doors immediately," Flexcoin said.
However, Flexcoin said that it would return all bitcoins held in ‘cold storage’ to their owners, which were kept on devices that were not connected to internet.
"Users who put their coins into cold storage will be contacted by Flexcoin and asked to verify their identity," the statement added.
"Once identified, cold storage coins will be transferred out free of charge. Cold storage coins were held offline and not within reach of the attacker. Flexcoin will attempt to work with law enforcement to trace the source of the hack."
On the same day, ‘Poloniex’ also lost 12.3% of its bitcoins mainly due to a reported flaw in transaction system.
Poloniex owner said in a statement: "I sincerely apologize for this, and I am very grateful to the many people who have already expressed their support and belief in my character."
"I take full responsibility; I will be donating some of my own money, and I will not be taking profit before the debt is paid," the owner added.
The latest hacking attack on bitcoin exchanges comes after world’s largest Bitcoin exchange Mt. Gox filed for bankruptcy, after announcing that it has outstanding debts of about $64m.
