Authorities investigate a shooting in the parking lot of the Twin Peaks restaurant in Waco, Texas on May 17, 2015.
Jerry Larson—AP
Updated: May 18, 2015 1:14 PM ET | Originally published: May 18, 2015 9:03 AM EDT

About 170 people have been arrested in connection with the Texas shooting Sunday that left nine dead, police said Monday.

The Waco Police Department said the 170 people being arrested were charged with engaging in organized crime. Officials revised earlier estimates of 192 arrests.

The shootout erupted between rival bike gangs at Twin Peaks restaurant on Sunday. Police had known that gangs would be congregating at Twin Peaks and were already at the restaurant. Despite law enforcement’s presence at the scene, nine people were killed in the brawl and 18 more were injured.

All of the deaths and injuries were among the bikers.

“I was amazed that we didn’t have innocent civilians killed or injured,” Waco police Sgt. W. Patrick Swanton said.

Write to Tessa Berenson at tessa.berenson@time.com.

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