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WACO, Texas — More than 190 people have been arrested after a shootout between rival bike gangs in Waco, Texas.

Nine people were killed in violence outside a restaurant.

The fight inside the restaurant began when punches were thrown and it quickly escalated to include chains and knives before guns were drawn

It’s not known what triggered the violence but police said tensions had simmered among rival gangs for months.

Police were aware in advance that at least three rival gangs would be gathering at the restaurant and at least 12 Waco officers in addition to state troopers were at the restaurant when the fight began.

Bystanders were trapped in the restaurant and inside their vehicles.