Google will now start sending out these messages to tens of thousands more people, as its methods for detecting suspicious activity have improved. These warnings are not being shown because Google’s internal systems have been compromised or because of a particular attack. Google has seen an increase in state-sponsored activity coming from the Middle East, a manager on Google’s information security team said. He declined to call out particular countries, but he said the activity was coming from “a slew of different countries” in the region.
Source: https://thehackernews.com/2012/10/google-warning-about-new-state.html