Singapore police say they are investigating reports of a man who allegedly cheated and overcharged unsuspecting passengers while posing as a driver for mobile app-based transportation company Uber.

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.

The U.S.-headquartered company only allows its registered drivers to accept bookings made through its app, and payments are cashless.

Uber Singapore confirmed Tuesday that the driver's vehicle was not registered with them, and said it filed reports against him to the police.

The Land Transport Authority said in a statement it had impounded the man's vehicle and was investigating the case.