In accounts posted to Facebook, several people said a man in a Honda Airwave station wagon claiming to be an Uber driver picked them up on the roadside and charged two or three times the normal rate.
One man recounted a March 1 incident on his Facebook page by saying the meter jumped 40 Singapore dollars (USD 29) in just three minutes, and that the total fare came to 97 Singapore dollars (USD 71), far higher than it should be. He said the driver then asked for cash payment and did not provide a receipt.
Uber Singapore confirmed Monday that the driver's vehicle was not registered with them, and said it filed reports against him to the police.
The US-headquartered company only allows its registered drivers to accept bookings made through its app, and payments are cashless.
The Land Transport Authority said in a statement it had impounded the man's vehicle and was investigating the case.
A police spokesman or woman told The Associated Press today that a 29-year-old man was assisting its investigations, although the police official didn't confirm that the man was indeed the suspected driver.