A significant campaign to harvest gmails from journos, politicos and military types has been discovered by Google. They have locked down the accounts and in this blog posting (see link below) explain how to enable two factor authentication.
From Official Google Blog:
Through the strength of our cloud-based security and abuse detection systems*, we recently uncovered a campaign to collect user passwords, likely through phishing. This campaign, which appears to originate from Jinan, China, affected what seem to be the personal Gmail accounts of hundreds of users including, among others, senior U.S. government officials, Chinese political activists, officials in several Asian
countries (predominantly South Korea), military personnel and journalists.
Be sure to check your account just to be on the safe side.
(Image used under CC from Oneras)