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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. Image Credit: AFP

A part-time Japanese pop singer is in a coma after being stabbed about 20 times by a fan near a concert site, police said Monday.

They said a suspect has been arrested and admitted that he intended to kill 20-year-old Mayu Tomita.

Japanese news reports said the suspect, Tomohiro Iwazaki, was angry because the singer had returned a gift that he had given her.

Tomita, who is also a college student, had reported to police that she was being harassed by Iwazaki on social media.

Police said Tomita was stabbed with a knife about 20 times in the attack on Saturday in western Tokyo.

In 2014, two members of the AKB48 girls’ group were knifed by a fan. Their injuries were not life-threatening.