You should immediately report a lost passport to the nearest Singapore Overseas Mission if you are abroad.
Passports reported lost cannot be used, even if later recovered. If you do recover your passport, you must surrender it to the nearest overseas mission or ICA within 14 days. Failure to surrender a recovered passport is an offence. You could face a fine and/or imprisonment.
Note: Under the Passports Act (Chapter 220), you must report a lost passport within 14 days of losing it. We recommend you report it immediately.