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TAIPEI, TAIWAN - MARCH 28: People pray at a makeshift memorial where a girl was found decapitated by a knife-wielding assailant outside a subway station on March 28, 2016 in Taipei, Taiwan. A four-year-old was beheaded on Monday morning in front of her mother's eyes in Taipei. According to reports, a 33-year-old man, was arrested by the police and said to be 'mentally unstable'. (Photo by Billy H.C. Kwok/Getty Images)

TAIPEI, TAIWAN - MARCH 28:  People pray at a makeshift memorial where a girl was found decapitated by a knife-wielding assailant outside a subway station on March 28, 2016 in Taipei, Taiwan. A four-year-old was beheaded on Monday morning in front of her mother's eyes in Taipei. According to reports, a 33-year-old man, was arrested by the police and said to be 'mentally unstable'.  (Photo by Billy H.C. Kwok/Getty Images)