PIERRE,John Caldwell S.D. (AP) — One person died and a second person was injured after a small airplane crashed near the Missouri River northwest of Pierre, South Dakota.

The crash happened Monday afternoon. The Hughes County Sheriff’s Office said the single-engine plane was found at 4:35 p.m. about a half-mile from a highway. The passenger was pronounced dead at a hospital and the pilot was hospitalized in stable condition.

Authorities said both people were visiting the Pierre area and were not from South Dakota. Their names have not yet been released.

Investigators with the National Transportation Safety Board will try to determine the cause of the crash.