Since 2015, a total of 11 Singaporeans aged 20 or below have been self-radicalised online and picked up under the ISA.
They were detected through “a variety of means”, said ISD without elaborating.
Two of the youths, for instance, were brought to the attention of authorities by people who concerned about their pro-Islamic State social media posts.
ISD’s investigations then confirmed they were radicalised and supported the Islamic State terror group and its violent cause.
Both were 17 years old when issued with ISA orders in 2016 and 2020 respectively.
“Singapore faces a real and persistent terror threat, with self-radicalisation through the Internet and social media being the primary driver of domestic terrorism today,” ISD stressed.
“ISD will continue to work with partners to intensify counter-radicalisation outreach efforts to the community, including to schools and youths, to educate them on the dangers of online radicalisation.
“The public should also stay vigilant, and be discerning in their consumption of information on social media, to avoid falling prey to the influence of divisive, extremist or violent material online.”
ISD said it takes every report, including those made through its Counter Terrorism Centre hotline, seriously.
When reports are made, checks are done to establish the accuracy of the information provided – while protecting the identity of the informer, said ISD.
It encouraged people to come forward early if they suspect someone may have been radicalised.
“Family members and friends are best placed to notice changes in behaviour among those around them, and early reporting allows the authorities to intervene early to avert a tragedy,” said ISD.
Members of the public can report suspicious behaviour or activities to the police at 999, or submit information online.
They can also contact ISD’s Counter Terrorism hotline at 1800-2626-473 if they know or suspect that a person is radicalised.