One person was killed and seven were injured in a shooting early Sunday at an outdoor festival in eastern Oklahoma, authorities said.

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Two juveniles were among those shot at the Memorial Day event near Taft, about 10 miles (16 kilometers) southeast of Tulsa, the Oklahoma State Bureau of Investigation said in a statement.

Witnesses said an argument precluded the gunfire just after midnight, the agency said. No one has been arrested, it said.

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About 1,500 people attended the event. Members of the Muskogee County Sheriff’s Office were also in attendance and immediately began rendering aid, OSBI said.

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The agency provided no other details including the conditions of those injured. The Muskogee County Sheriff’s Office referred the Associated Press to OSBI for more information. A bureau spokeswoman has not responded to the AP’s calls.