Tokyo December 17, 2014; Norihiko Shirouzu writing for Reuters reported that Honda Motor Co was so concerned by mounting recalls for Takata air bags, and frustrated by its supplier's failure to explain why some have exploded, killing five people with shrapnel, that it bought used and scrapped cars in Japan to conduct its own tests. Around 21 million vehicles have been recalled globally by automakers since 2008 for defective Takata inflators.