Police braced for retaliation attacks after 170 people were charged on Monday in connection with the shootout among motorcycle gangs a day earlier that left nine dead and 18 wounded at a Waco, Texas, restaurant turned into a blood-soaked crime scene.

Bikers from five rival gangs attacked each other with guns, knives, brass knuckles, clubs and motorcycle chains at a Twin Peaks Sports Bar and Grill in the central Texas city. No bystanders or police were injured, police said.

When the bikers began shooting, officers stationed outside moved in, some of them also firing their weapons. When the shooting ended, bodies were scattered in the restaurant and across two parking lots.

“Yesterday’s events was bad guys on bad guys. When our officers arrived, those bad guys turned their guns on our officers,” Waco Police Sergeant Patrick Swanton told a news briefing.

Bikers were reported to be traveling to the city following the shooting and police have been threatened, he said.

“There was a green light put out on law enforcement, is our understanding from last night. We are aware of that threat,” Swanton said.

About 100 weapons were recovered from the crime scene, which was strewn with shell casings, police said.

“We are not in a rush. This is obviously a very large investigation involving numerous agencies and organizations and we are going to get it right,” he said.

The arrested group was first taken to a local convention center and then moved to a county jail. Police took positions on overpasses and building tops to provide security.

“We have layers of protection,” Swanton said.

Those taken into custody were charged with engaging in organized crime for capital murder and likely will face other charges related to the bloodshed after an investigation of the sprawling crime scene.