"Google’s Internet search service malfunctioned for nearly 55 minutes Saturday morning, upending users around the world with search results that carried false safety warnings and Web links that did not work.
The company acknowledged Saturday that all searches produced links with the same warning message: “This site may harm your computer.” Clicking on any of the links led to an error message stating that the desired site could not be reached.
“What happened?” Google explained in its blog. “Very simply, human error.”
Google said it periodically updates its list of sites suspected of carrying dangerous software that could harm computers, and that Saturday morning a Google employee mistyped a Web address for one such site, causing all sites to be flagged harmful."