TURNER, Maine (AP) Game wardens are investigating an all-terrain vehicle rash in which the 10-year-old operator was critically injured, officials said.

The boy was operating the ATV without a helmet when it crashed and rolled over him on Monday, said Mark Latti, a warden spokesperson.

The boy was transported by LifeFlight to Maine Medical Center in Portland where he was listed in critical condition. The initial investigation points to a lack of experience and supervision, Latti said.