The incident happened on Sunday night in Plano, a Dallas suburb. It is believed the shoot-out was prompted by a "domestic dispute" at the party for fans of NFL team the Dallas Cowboys, the US media reported.
Police spokesman David Tilley said the shooter was killed by the first responding officer after an exchange of gunfire.
Seven bodies were found in the house. Two others were wounded in the shoot-out and taken to a hospital, the authorities were quoted as saying by the New York Times.
The motive behind the shooting had not been established yet.
"That's still unclear," said Officer David Tilley, a spokesman for the Plano police. "We're still trying to figure that out."
The episode began a few minutes after 8 p.m., when the police received reports of shots fired at the house. "Our first responding officer heard gunshots, made entry in the house and confronted the suspect, ultimately shooting and killing the suspect," Officer Tilley said.
One witness said she heard between 30 and 40 shots fired around 8 p.m. local time.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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