TOKYO – Japan's two biggest airlines grounded all their Boeing 787 aircraft for safety checks Wednesday after one was forced to make an emergency landing in the latest blow for the new jet.

All Nippon Airways said a cockpit message showed battery problems and a burning smell was detected in the cockpit and the cabin, forcing the 787 on a domestic flight to land at Takamatsu airport in western Japan.

It said a later inspection of the plane found leaking electrolyte and burn marks around the main battery, located in an area below the cockpit.