A man believed to be in his 20s frequently visited Nippon Television Network Corp. in Tokyo, asking to meet with an NTV newscaster and a teenage actress, both of whom later became targets of letter bombs, police sources said July 17.

Newscaster Yumi Ida, 39, was targeted with a letter bomb July 16. Actress Yumi Adachi, who starred in an NTV drama series, was sent a letter bomb three years ago.

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