Google took almost three years to disclose to WikiLeaks that it had handed over emails and other digital data belonging to three of its staffers to the US government, under a secret search warrant issued by a federal judge. WikiLeaks has written to Google’s executive chairman, Eric Schmidt, to protest that the search giant only revealed the warrants last month, having been served them in March 2012. In the letter, WikiLeaks says it is “astonished and disturbed” that Google waited more than two and-a-half years.