REDMOND (AP) — Police shut down an Oregon motorcycle rally following a confrontation between biker groups, prompting the cancelation of a headlining concert and catching some event-goers in mid-tattoo. Redmond Police Capt. Brian McNaughton said a large contingent of the Mongols organization arrived at the Run to the Cascades rally at the Deschutes County Fairgrounds on Saturday evening and threatened members of the Hells Angels with violence if they didn’t leave. KTVZ-TV reports that the Hells Angels did pack up, but witnesses told law enforcement that they said they were coming back with more members to settle the dispute. “Witnesses …