The great firewall of China is now blocking one of Google’s major applications, Gmail. The web-app version of the service was already blocked in China but now third-party services and the actual Google Gmail application that was part of the iOS system has now been blocked as well.

Google’s Transparency Report site shows an 85% decline in usage on December 26, then on December 27 the usage hit zero.

“We’ve checked and there’s nothing wrong on our end,” Google said in a statement after the news was first reported. Many Chinese citizens use popular Virtual Private Networks (VPNs) to get around the firewall imposed by the government, but for Google it’s a major blow, losing the most populated internet traffic source by country in the world, in just a matter of two days.