Japan has acknowledged that it conducted only a limited investigation before claiming there was no official evidence that its imperial troops coerced Asian women into sexual slavery before and during World War II. (Photo: A South Korean former 'comfort woman' (center), who was forced to serve as a sex slave for Japanese troops during World War II, holds a butterfly-shaped placard reading 'official apology,' during the 1,035th weekly protest against Japan in front of the Japanese embassy in Seoul on August 15, 2012.
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