The casino is located in Green Bay, Wisconsin.
Three people were shot dead, including the sniper, and one person was seriously injured after police responded to an active sniper situation at Oneida Casino in Wisconsin on Saturday night.
The initial incident started at the Duck Creek restaurant in the main casino located in Green Bay, near Austin Straubel Airport.
Lieutenant Kevin Pawoak and Chief Joel Maxam of the Brown County Sheriff’s Office gave a press conference a few hours after the shooting and said some victims were shot inside the Radisson Hotel which is connected to Casino Oneido.
“Our investigation team is actively working to obtain testimony from eyewitnesses and to process evidence,” the sheriff’s official said in a statement on Sunday afternoon.
Authorities said investigators were likely to work at the casino collecting evidence on Sunday night.
The names of the shooter and the victims will not be released until a notification is made to relatives, the sheriff’s department said.
Authorities confirmed that all Brown County agencies responded to the scene, including local firefighters and rescue squads, and that the DCI was also helping along with the FBI.
Pawoak and Maxam suggested that there is some possible relationship regarding employment with the sniper during the press conference, but they did not elaborate.
No information on the type of weapon used in the shooting was provided, but the target was considered an official. It is currently unclear whether the sniper was an employee or had a personal relationship with the employee at the restaurant.
The police say that the casino was immediately emptied and that the witnesses’ testimonies are still being collected.
The sheriff’s department asked anyone who witnessed the shooting to contact the homicide detective immediately.
Governor Tony Evers and his wife, Kathy Evers, issued a statement saying they were “devastated” to hear about the casino shooting.
“Our hearts, thoughts and support go to the Oneida Nation, the Ashwaubenon and Green Bay communities, and all those affected by this tragedy,” said Evers. “While we wait for more information, we hope and pray that the wounded will recover and we appreciate the first aid that responded quickly to the situation.”
Wisconsin Attorney General Josh Kaul said on Twitter that the situation was contained and that there was no longer a threat to the community.
Oneida Nation officials said all casinos would be closed until further notice.