Hackers who broke into the International Monetary Fund's computer system may have been backed by a nation state, according to security experts.
They point to the sophisticated nature of the attack and the resources needed to develop it.
Malicious software, designed to steal confidential files, was installed on at least one IMF computer.
Although government involvement is widely suspected, the IMF has not released enough details to be sure.
Based on the limited information made public, it appears that the attack came from a specific PC that had been deliberately infected.
Hacker software was likely to have been installed on it in what is known as a spear-phishing attack, which sees highly targeted scam e-mails sent to specific victims.
A memo circulated internally at the IMF reported that "suspicious file transfers" had been detected.
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