Nanjing police have arrested four suspects involved in a shooting incident on a viaduct due to a gambling dispute.

On Oct 17, three of the suspects driving a black car intercepted two people in an Audi before shooting three times at one of the car's rear windows.

The Audi crashed into five cars when it turned around to avoid the suspects' car.

Police later found that the shooting was related to a gambling dispute between a person surnamed Zhang and one of the two people in the Audi.

Two of the four suspects were born in the 1990s, according to local police.