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This undated picture sourced from Twitter and released by Jiji shows 20-year-old Japanese pop star Mayu Tomita.
The Japanese pop star who was repeatedly knifed in a frenzied attack on May 21 by an obsessive fan was in a critical condition, police and reports said. / AFP PHOTO / JIJI PRESS / JIJI PRESS /  - Japan OUT / EDITORS NOTE --- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / JIJI" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTSJIJI PRESS/AFP/Getty Images
This undated picture sourced from Twitter and released by Jiji shows 20-year-old Japanese pop star Mayu Tomita.
The Japanese pop star who was repeatedly knifed in a frenzied attack on May 21 by an obsessive fan was in a critical condition, police and reports said. / AFP PHOTO / JIJI PRESS / JIJI PRESS /  - Japan OUT / EDITORS NOTE --- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / JIJI" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTSJIJI PRESS/AFP/Getty Images

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    Pop star stabbed by fan

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Pop star stabbed by fan

Police say Japanese pop idol Mayu Tomita was stabbed multiple times by a fan in western Tokyo.

Pop star stabbed by fan

Police say Japanese pop idol Mayu Tomita was stabbed multiple times by a fan in western Tokyo.