Update:
IDA has informed that the websites are going through maintenance.
Reader contribution:
Do keep us updated if you have more news.
The list of government websites which have been reported as down intermittently so far:
Prisons.gov.sg
PMO.gov.sg
MSF.gov.sg
SEAB.gov.sg
SPF.gov.sg
AVA.gov.sg
LTA.gov.sg
ACRA.gov.sg
IDA.gov.sg
Singpass.gov.sg
SGDI.gov.sg
Careers.gov.sg
PUB.gov.sg
GOV.SG
MHA.gov.sg
CNB.gov.sg
ISD.gov.sg
ICA.gov.sg
NRF.gov.sg
CPIB.gov.sg
WDA.gov.sg
PSC.gov.sg
ISTANA.Gov.sg
SMC.gov.sg
SCDF.gov.sg
SLA.gov.sg
Supremecourt.gov.sg
NEA.gov.sg
BCA.gov.sg
CUSTOMS.gov.sg
SPRING.gov.sg
AGC.gov.sg
Source: http://therealsingapore.com