The driver and a taxi passenger, aged 64 and 30 respectively, are reportedly in critical condition. Three others were also injured.
The police have since opened a cased into violating traffic rules, trying to find out whether the driver had health issues because there was an SOS signal flashing on the taxi sign that is normally used to show if the car is available.
Witnesses said the taxi was waiting for a green traffic light but suddenly launched into motion while blowing the horn. No traces of braking have been found.