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The World Bank Group's computer network — one of the largest repositories of sensitive data about the economies of every nation — has been raided repeatedly by outsiders for more than a year, FOX News has learned.

It is still not known how much information was stolen. But sources inside the bank confirm that servers in the institution's highly-restricted treasury unit were deeply penetrated with spy software last April. Invaders also had full access to the rest of the bank's network for nearly a month in June and July.

The World Bank has denied reports that hackers penetrated its network on multiple occasions over the last year.

Fox News reports the financial institution has suffered at least six attacks since the middle of 2007. The assault emerged in the course of a separate FBI investigation, prompting the bank to issue a memo (pdf) to warn workers.

Kellerman served as a senior risk-management specialist at the World Bank from 2000 to 2006; he helped set up the bank's cyberdefenses. "Every financial organization is under siege," he says.

World Bank spokesman Carl Hanlon confirmed the authenticity of bank memos obtained by Behar describing how bank officials discovered — and reacted to — the cyberbreak-in. "The bottom line is that at no point was any sensitive information accessed," Hanlon said in a phone interview.