The four Singaporeans, along with 10 others, were detained last year for trying to rig football matches.
They have been detained without charge for the past year on detention order issued on October 2, 2013, said the Home Affairs Ministry here.
One of the four has been identified as Dan Tan, also known as Tan Seet Eng, a Singaporean businessman suspected of being the head of a global football match-fixing syndicate, according to a report by the Channel News Asia today.
He reiterated that Singapore continues its efforts to stamp out match-fixing.
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"Singapore will do our part to support global effort to stamp out crime and preserve the integrity of sports," said Masagos.
"We will maintain our zero tolerance approach towards corruption and in this context for match-fixing. Offenders have and will continue to be dealt with firmly and resolutely under our laws," said Masagos while attending the Securing Sport Conference 2014 in London.
Last year, European police said a Singapore-based syndicate had made 8 million Euros (SGD 12.9 million) by rigging at least 380 football games in Europe alone.