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Bikers congregate against a wall while authorities investigate a Twin Peaks restaurant Sunday, May 17, 2015, in Waco, Texas. Waco Police Sgt. W. Patrick Swanton told KWTX-TV there were "multiple victims" after gunfire erupted between rival biker gangs at the restaurant. (Rod Aydelotte/Waco Tribune-Herald via AP)
Bikers congregate against a wall while authorities investigate a Twin Peaks restaurant Sunday, May 17, 2015, in Waco, Texas. Waco Police Sgt. W. Patrick Swanton told KWTX-TV there were "multiple victims" after gunfire erupted between rival biker gangs at the restaurant. (Rod Aydelotte/Waco Tribune-Herald via AP)

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    Ex-Hells Angel leader on gang rivalries

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Ex-Hells Angel leader on gang rivalries

Former Minnesota Hells Angels president Pat Matter, author of "Breaking the Code," says retaliation against police is unlikely in Waco, Texas.

Ex-Hells Angel leader on gang rivalries

Former Minnesota Hells Angels president Pat Matter, author of "Breaking the Code," says retaliation against police is unlikely in Waco, Texas.