Political donation certificates, which candidates must submit to contest in the Bukit Batok by-election, have been issued to five people, the Elections Department (ELD) said yesterday.
It is one of the documents electoral candidates must hand in on Nomination Day tomorrow, to run in the May 7 polls at the single-member constituency (SMC).
Five people had initially collected the certificate and the number remained unchanged by last Saturday, the closing date.
The ELD did not disclose the names of those issued the certificates. But only one of the five has yet to be identified.
Among the others are Mr Murali Pillai, 48, of the People's Action Party (PAP) and Dr Chee Soon Juan, 53, of the Singapore Democratic Party.
Both had declared their intention to run last month, before the writ of election was issued on April 20.
The other two are private-hire car driver Sherwin Eu, 32, and former opposition candidate Abdul Rahim Osman, 59.
The duo have yet to confirm whether they would contest the polls. If they do, the SMC will have a multi- cornered fight, as was seen in Punggol East SMC by-election in 2013.
The Bukit Batok seat was vacated after former PAP MP David Ong resigned on March 12 over an alleged extramarital affair.
Separately, the police said yesterday that candidates can apply for permits for election meetings and vehicle processions in the constituency after Nomination Day.
The meetings can be held indoors or outdoors for eight days, from April 28 to May 5, between 7am and 10pm.
The police listed a stadium and an open field as rally sites. They did not specify where these were, but the nearest stadium is Bukit Gombak.
The list of outdoor rally sites will be announced at the end of nomination proceedings tomorrow.
Candidates can also use perambulating vehicles fitted with loudspeakers between 2pm and 10pm tomorrow, and between 7am and 10pm for the rest of the campaign period.
The hustings have yet to begin formally, but yesterday Mr Pillai and Dr Chee were pounding the ground, going door to door to meet residents.