Japan's three biggest carmakers are expanding a huge global recall triggered by potentially fatal air bags made by Takata Corp, saying on Wednesday they will take back millions of vehicles worldwide for investigation.

Toyota Motor Corp and Nissan Motor Co said they are recalling some 6.5 million vehicles globally, while Honda Motor Co Ltd said it would follow suit, without giving details. A U.S. Honda spokesman added, however, that any potential action would not affect cars that were sold in the United States.

Wednesday's announcements raise to roughly 31 million the number of vehicles recalled worldwide since 2008 over Takata air bag inflators, which can erupt with too much force, spraying shrapnel inside the car.