SINGAPORE – Three Singaporean teenagers aged between 14 and 19, who were self-radicalised by violent extremist ideologies and planned to carry out separate attacks here, have been detained under the Internal Security Act (ISA). The cases are unrelated.One of them was a 14-year-old student who was arrested in May, a month before his intended attack on his school.The Secondary 2 student supported militant group ISIS, idolised mass shooters and made plans to carry out a mass stabbing at his secondary school during the June holidays, said the Internal Security Department (ISD) on July 27.ISD withholds the names of detainees under 18 years...