An $8.5 million lawsuit was filed against Mid-Columbia Head Start and its volunteer William Frank Osborne, alleging the pre-school program did not adequately supervise Osborne, who has been accused of sexually assaulting several children in his care.

The suit, filed Nov. 9 in Wasco County Circuit Court, named Mid-Columbia Children’s Council Inc., the non-profit organization that runs the Head Start program. The program serves 3- to 5-year-olds.