Ahead of Nomination Day for the presidential election, the police have issued an advisory to candidates and their supporters who plan to turn up to observe proceedings.

The Nomination Centre - the People's Association headquarters in King George's Avenue - will be open from 10am on Wednesday.

The police said in an advisory that supporters of the candidates and members of the public should arrive only after then.

Nomination proceedings will start at 11am.

So far, three people have applied to run in the election: former Speaker of Parliament Halimah Yacob, 63, and businessmen Salleh Marican, 67, and Farid Khan, 61.

The six-member Presidential Elections Committee is vetting their applications and will inform those who qualify by Tuesday.

The trio will also need a certificate from the Community Committee, as the election is reserved for Malay candidates following changes to the Constitution to ensure the presidency reflects Singapore's multiracial society.

The police said only vehicles with approved decals will be allowed to enter and park within the centre on Wednesday.

Officers will conduct checks in and around the venue for dangerous items such as sharp objects, and any belongings taken into the centre will be checked. For this reason, supporters should refrain from taking along bags, said the police.

Candidate placards, flags and banners can be displayed in the centre only after the closure of nomination proceedings, and supporters should assemble and disperse in an orderly manner, it added. Unmanned aerial vehicles or drones cannot be flown over the centre.

The police said it will take action against those who are unruly or who commit any offence.

If there is more than one candidate qualified to run, voters will go to the polls to pick a new president on Sept 23. Otherwise, the president will be declared at the close of nomination proceedings.