Suspect told police, 'I bumped my arm with the arm of someone I don't know'
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Police are now examining security camera footage for clues in the case
Suspect told police, ‘Possibly it was me who did it’
Suspect told police, 'I was in debt several hundred million yen'
Officers are now examining security camera footage
Suspect denies the allegations, telling police, 'I did not exert violence'
Suspect loaded the fluid into a syringe beforehand, police said
Suspect told police, 'I did it to satisfy my sexual desire'