The teacher had reportedly taken a leave of absence last year due to depression.
Surgeons also removed multiple gastric stones, some measuring up to 6cm.
He was sent to hospital for treatment.
During the transition period, urgent counter services will be provided only upon request.
He is the third Singaporean radicalised by far-right extremist ideologies to be dealt with under the ISA.
A woman was about to board a taxi with two children when the car slammed into them.
Without her family's knowledge, she managed multiple extremist groups online, some with over 1,000 members.
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The local police commissioner stated that Sheeran had not been granted permission for the performance.