Singapore is grappling with an accelerating wave of youth radicalisation, with authorities warning that the time it takes for young people to embrace extremist ideologies has halved over the past decade as social media increasingly drives exposure to violent content. Recent arrests of teenagers accused of planning attacks have intensified debate over school security, digital resilience and the challenge of protecting young people without undermining the openness of educational environments.
Singapore is facing growing concern over the rapid radicalisation of young people following a series of arrests involving teenagers allegedly inspired by extremist ideologies and planning acts of violence. Authorities say the pace at which individuals become radicalised has doubled in recent years, prompting renewed attention to the influence of online platforms, the role of schools and the need for stronger preventive measures.
Over a three-month period this year, three teenagers were detained under Singapore’s Internal Security Act (ISA), reigniting public discussion over school safety and whether more should be done to foster critical thinking among students. Last Monday, the Internal Security Department (ISD) announced that three youths, aged 14, 15 and 19, who were detained between April and June, had been radicalised by groups and ideologies including Islamic State (Isis), Hamas and far-right extremism.
Among them, 19-year-old Tan Jun Jie allegedly planned knife attacks targeting Singapore Armed Forces personnel at Sembawang Air Base and LGBTQ students at his school. Separately, a 14-year-old was arrested one month before he allegedly intended to carry out a stabbing attack at his secondary school during the June school holidays.
The arrests have raised questions about whether schools require stronger security measures. However, Senior Minister K Shanmugam, who also serves as coordinating minister for national security, cautioned against transforming educational institutions into heavily fortified environments.
“You can’t turn every school into a garrison or a cantonment, then it won’t feel like a school,” Shanmugam said last Monday.
Education Minister Desmond Lee said schools already maintained multiple layers of vigilance through training, contingency planning, security personnel, closed-circuit television cameras and selective bag checks when necessary. At the same time, he stressed that schools must remain welcoming places where students feel comfortable learning.
Under Singapore’s Internal Security Act, the ISD has the authority to detain individuals considered threats to national security without trial. In recent years, an increasing proportion of those dealt with under the legislation have been young people aged 20 and below. According to the ISD and then Senior Minister Teo Chee Hean in 2024, 23 people aged between 14 and 20 have been dealt with under the ISA over the past decade, compared with just one before 2015.
The ISD attributed this trend largely to social media and online platforms, which have significantly shortened the period between an individual’s first exposure to extremist material and their adoption of violent ideologies. It described how recommendation algorithms create a “rabbit-hole” effect, directing users towards progressively more extreme content while online communities reinforce beliefs through echo chambers.
According to the department, the average time required for self-radicalisation has fallen from 24 months before 2015 to 12 months between 2021 and 2025. It also cited the case of a 15-year-old pro-Isis girl who received a restriction order in February 2025 after becoming radicalised within weeks.
Responding to questions about whether the Israel-Gaza conflict had contributed to increased radicalisation, the ISD acknowledged that the conflict was an emotive issue and that Singaporeans were deeply concerned about the humanitarian crisis in Gaza. However, it stressed that Singapore drew a clear distinction between concern for humanitarian suffering and the promotion of extremist narratives that incite hatred and violence.
The recent cases have also prompted discussion over how education can help prevent radicalisation. Forum letters published in The Straits Times debated whether schools should strengthen religious education and critical thinking programmes. Lee said schools already provide Character and Citizenship Education designed to help students recognise and reject harmful online content, including extremist ideologies, while the ministry is considering further improvements. He added that the education ministry works closely with the ISD to equip school staff and student welfare officers to identify warning signs at an early stage.
Experts argue that prevention requires more than security measures alone. Shashi Jayakumar, executive director of SJK Geostrategic Advisory, said young people whose critical faculties were still developing could become especially vulnerable to online echo chambers that reinforce hostile worldviews and create perceptions of an “out group”. In some cases, he said, counselling and psychological intervention aimed at disengaging individuals from violent pathways, alongside mentoring, may be more effective than deradicalisation alone.
Salim Mohamed Nasir, a member of the Religious Rehabilitation Group, similarly argued that restricting access to information was not the answer. Instead, he said young people should be encouraged to engage thoughtfully with global issues by developing critical thinking, digital literacy, emotional resilience and trusted relationships with parents, teachers and mentors. Stronger connections within schools, families and communities, he added, remain the most effective safeguard against violent extremist narratives.
Singapore’s concerns reflect a wider regional trend. In June, two boys aged 14 and 15 opened fire on schoolmates in the Philippines, killing three people and injuring 20, with investigators suggesting possible links to an online extremist network. Earlier this year, Malaysian police also arrested six people aged between 16 and 21 during counterterrorism operations, including three suspects under the age of 18 accused of supporting Isis and planning local attacks.
