Three men have been arrested in connection with a fatal shootout between rival motorcycle gangs at an Oklahoma City bar, according to police.

Affidavits filed against the three suspects say Sunday's fight involved the rival Bandidos and Homietos biker gangs and began when a Bandido hit a member of the Homietos in the head from behind. Three people ended up dead and three more wounded, one of whom has been arrested, police Sgt. Gary Knight said.

OKLAHOMA CITY SHOOTOUT: BIKER GANG SURROUNDED BAR, GUNNED DOWN RIVALS IN ATTACK FROM BEHIND, COURT DOCS

A 41-year-old man and a 47-year-old man were arrested Thursday, after the 34-year-old man was arrested Monday.

Whiskey Barrel Oberholtzer inset

Eric Oberholtzer, the alleged leader of the Homietos Motorcycle Club in Oklahoma City, was killed in an ambush shootout involving the rival Bandidos biker gang Saturday, court documents reveal. Three men have since been arrested in connection with the shootout. (Google Maps, Eric Oberholtzer/Facebook)

Knight said Friday that police were still investigating what sparked the fight at the Whiskey Barrel Saloon in the city’s southwest.

OKLAHOMA CITY BIKER GANG SHOOT-OUT LEAVES 3 DEAD, 3 INJURED; 1 ARRESTED ON MURDER CHARGE, POLICE SAY

Two of the suspects were arrested on first-degree murder warrants and the third on a warrant alleging shooting with intent to kill, conspiracy and other charges.

Court documents do not show that formal charges have been filed against any of the men, who are jailed in lieu of bond, and no attorneys are listed who could speak on their behalf.

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Police identified the third person killed as 28-year-old Andrew Sump, having earlier named victims 29-year-old Eric Oberholzer and 38-year-old Francisco Tanajara.