Taipei, July 20 (CNA) Cheng Chieh, the sole suspect in the May 21 knife-attack on a Taipei metro train, will be indicted Monday, the last day of a two-month detention followiong his arrest.

Four persons were killed and 24 injured in the first deadly subway knife-attack in Taiwan's history.

The 21-year-old university student has been under detention since May 22.

Prosecution investigation into this case has included a psychological evaluation on Cheng at National Taiwan University Hospital, according the New Taipei District Prosecutors Office.

(By Wang Hung-kuo and S.C. Chang)
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