Why shooting took place at concert-car show in Arizona that killed three and injured five others?

A night meant for music and community turned tragic in a suburban Phoenix restaurant on Sunday, as a long-standing feud between rival groups spiralled into deadly violence in the United States' Arizona state. What began as a confrontation escalated into a chaotic shooting outside El Camaron Gigante Mariscos & Steakhouse, where a concert and car show were underway, according to police. Three people, including a teenager, lost their lives in the sudden gunfire, while five others sustained injuries.

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