BOSTON - Researchers have found evidence suggesting that the United States may have developed three previously unknown computer viruses for use in espionage operations or cyber warfare.

The findings are likely to bolster a growing view that the US government is using cyber technology more widely than previously believed to further its interests in the Middle East. The United States has already been linked to the Stuxnet Trojan that attacked Iran's nuclear program in 2010 and the sophisticated Flame cyber surveillance tool that was uncovered in May.

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