大象传媒

A biker gang expert says that "retaliation is almost inevitable", and could take years to play out, after a Waco gun battle left 9 dead and 18 injured.

Texas police say that 170 people are to face organised crime charges.

Julian Cher, an author of two books about biker gangs, said: "Gangs feel that they have to retaliate. I have known of cases where they might take years to wreak their vengeance".

The feud broke out between several gangs - including The Bandidos and The Cossacks - at a shopping district.

And what started as a fist fight soon descended into a battle with knives, clubs, chains and eventually guns.