SINGAPORE, Aug. 18 -- Three Primary 3 students at Sengkang Green Primary School here have been suspended after making chilling death threats to a parent who reported their alleged bullying of her 9-year-old daughter, escalating a months-long harassment case that has now prompted police intervention.

A Facebook user named Ni Yin posted on Aug 14 claiming to be the victim's mother and detailed the alleged bullying that led to the threats against her and her family, including an audio clip where a person threatened to "dissect her into pieces" and "end her life in school."

The mother said her daughter had been bullied "multiple times" over almost six months and called for stronger action from the Ministry of Education (MOE) and the school,...