Two Kansas women who vanished as they tried to pick up children for a birthday party two weeks ago were killed over a custody dispute involving a group of anti-government Oklahomans calling themselves “God’s Misfits,” authorities said Monday.

Their vehicle was found March 30 along a rural Oklahoma highway with ample evidence of a bloody confrontation, setting off a multi-agency effort to secure the children’s safety while searching for the women and avoiding more violence.

Veronica Butler, 27, and Jilian Kelley, 39, of Hugoton, Kansas, had arranged with the grandmother of Butler’s two children to meet at a highway intersection on the morning of March 30 and pick up the 6- and 8-year-old.