YANKTON, S.D. (KELO) — Authorities in Yankton are investigating a child’s death.

Yankton Police say officers were called to the 300 block of West 25th Street around 5:20 p.m. CT for a report of an unresponsive child. EMS and police were unable to revive the child.

Authorities determined that the child had been left in a vehicle for an extended period of time. At this time, an autopsy has been requested.

The temperature in Yankton when the child was found in the vehicle was 100° with a heat index of 110.

Police say more details will be released as they become available.