U.S. regulators grounded Boeing Co's 787 Dreamliner passenger jet on Wednesday, saying a recent series of safety incidents meant urgent action was needed.
The Federal Aviation Administration said it would require airlines to demonstrate that the plane's cutting-edge batteries were safe before allowing further flights. It has notified regulators in other countries of its action as well.
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Japan's two leading airlines already grounded their fleets of Boeing 787s on Wednesday after one of the Dreamliner passenger jets made an emergency landing, the latest in a series of incidents that have heightened safety concerns over a plane many see as the future of commercial aviation.
All Nippon Airways Co said instruments aboard a domestic flight indicated a battery error, triggering emergency warnings. The incident was described by a transport ministry official as "highly serious" - language used in international safety circles as indicating there could have been an accident.
Boeing shares fell 2 percent in after-hours trading to $72.80 after the FAA announcement.
(Additional reporting by Olivier Fabre, Kentaro Sugiyama, Mari Saito, Yoshiyuki Osada, Deborah Charles, Tim Hepher, Anurag Kotoky, Jaroslaw Kowalski, Danilo Masoni and James Topham; Writing by Ben Berkowitz; Editing by Gary Hill)