Ride hailing company Uber is facing a Corrupt Practices Investigation Bureau probe over recent car purchases made by its local car rental company, Lion City Rentaal (LCR).
According to reports, CPIB officers have called up former and current Uber staff over LCR's purchases.
Uber owns a majority in LCR, which owns about 15,000 private hire vehicles.
CPIB has declined to comment on the case.
"Due to the nature of our work, we will not confirm or deny whether any individual or entity is being investigated for corrupt practices or any criminal activities.''
When contacted, an Uber spokesman said: "We do not comment on rumours or market speculation.''
The troubled company is now facing a US federal probe for its businesses in at least 5 Asian countries: China, India, Indonesia, Malaysia and South Korea.