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SAN FRANCISCO (AP) — A cab driver may have experienced a medical emergency when his taxi jumped a curb and plowed into two people on a downtown San Francisco sidewalk.

The San Francisco Chronicle reports ( ) police are still investigating what led the crash, but they believe the driver may have had a medical emergency before the taxi veered into the busy street corner.

The vehicle hit an advertising kiosk and slammed into two people at a shoeshine stand Tuesday afternoon.

A spokesman for San Francisco General Hospital says the victims remained hospitalized Wednesday, one in critical condition. The driver, who was also injured in the collision, has been released.