After smoke was found pouring into one of its Boeing 787 “Dreamliner” planes yesterday, forcing an emergency landing, Japan’s All Nippon Airways grounded its entire fleet of 787s. Japan’s Transport Ministry referred to this as a “major incident.” Today, the Federal Aviation Administration has decided to ground all 787s in the US–that’d be six of them, all operated by United.

The FAA had already begun a full-scale investigation into the safety of the much-maligned 787, which has had more than its share of issues since introduction, but this is a huge move. The problem seems to be with the plane’s lithium ion batteries. We’ll let you know more as soon as we know. [via The Verge]