The Ministry of Defence (MINDEF) had alerted the Internal Security Department (ISD) that Amirull bin Ali, then serving his full-time National Service (NS) as an administrative support assistant, could have been radicalised by extremist ideologies. ISD's subsequent investigations confirmed that he had been self-radicalised. Amirull has been issued an order of detention under the Internal Security Act.

Both MINDEF's and ISD's investigations revealed that Amirull did not attempt to influence others in his NS unit. No Singapore Armed Forces (SAF) equipment in his unit was missing. Nonetheless, the SAF will continue to maintain a high degree of vigilance against potential signs of radicalism and extremism among our servicemen.