Google's search service has been hit by technical problems, with users unable to access search results.
Google says users got an erroneous message when they did searches on many sites, saying: "This site may harm your computer."
The problem began at 1430 GMT and ended at 1525 GMT.
On its blog the company wrote: "What happened? Very simply, human error."
Google said it flags search results with the message when a site is known to install malicious software.
Instead, many other sites were affected.
