White smoke was seen outside of the plane and a battery cell reportedly showed signs of leaking.
This isn't the first time a 787 has been grounded. Nearly a year ago, a fire started aboard a different Japan Airlines' 787 at Logan International Airport in Boston. The National Transportation Safety Board continues its investigation into the cause of the fire and expects to make its findings public in the fall, the NTSB announced last week.
Both Japan Airlines and All Nippon Airways grounded their 787 fleets after two 787 batteries overheated on two planes within a few weeks last year. Regulators then grounded the fleet in January 2013 for three months. Boeing had to redesign the battery and prove the planes to be both safe and reliable before they could fly again.
The Wall Street Journal reports that other airlines are operating the jet as normal while Boeing investigates the incident. Japan Airlines plans to return the jet to service after replacing the affected battery.