The Pawnee Nation of Oklahoma is mourning the loss of five members, including a mother and three of her children.

Marissa Leigh Chapman Campbell, 37, and her children William Lee Campbell, 17, Maizy Maya Campbell, 11, and Lucas Wayne Campbell, 22 months, were killed in an accident on Sunday. Also killed was Shane Horn, 16, who was William's best friend.

"We are mourning the loss of Marissa Campbell; her three children, William, Maizy, and Luke; and Shane Horn," the tribe said on its Facebook page.

The Facebook page provides information about a benefit fund for the Campbell family. They are survived by Wayne Campbell, the husband and father.

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Friends remember five from Pawnee killed in traffic accident (The Oklahoman 7/20)