The Latest on shooting and stabbing incident that left one dead and seven others injured at a motorcycle expo (all times local):

1:30 p.m.

Police say more than one person opened fire during a deadly weekend brawl at a Denver motorcycle show, but they still don't know who fired the fatal shot.

Major Crimes Cmdr. Ron Saunier says investigators still are examining several guns and interviewing witnesses about the Saturday melee that left one dead and seven others injured at the crowded Colorado Motorcycle Expo.

Attorneys for two biker groups, including one made up of law enforcement, have blamed each other for inciting the violence. No arrests have been made.

Saunier says one of the groups is being more cooperative with police than the other, which he described as an outlaw gang.

A Colorado Department of Corrections officer opened fire, but Saunier says there's no sign that he did so in his official capacity.

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9:55 a.m.

No one has been arrested after a weekend brawl at a Denver motorcycle show that left one dead and seven others injured.

Attorneys for two biker groups, including one made up mostly of law enforcement, have blamed each other for inciting the violence. The medical examiner's office said Monday that 46-year-old Victor Mendoza was shot and killed Saturday.

Stephen Stubbs, an attorney for the Mongols Motorcycle Club, says the man killed was a member of that group.

A Colorado Department of Corrections officer and member of the Iron Order Motorcycle Club opened fire during the melee, but police haven't said whether he fired the fatal shot and have reported no arrests.

John C. Whitfield, who represents Iron Order, says Mongols jumped its members, instigating the fight.

Stubbs says Iron Order members started it.