The death of a 4-year-old boy in Northwest Missouri is being investigated as a homicide. The Missouri Highway Patrol announced the investigation Wednesday, one day after an autopsy showed the boy died of blunt-force trauma.

Authorities say a Clinton County ambulance was sent to a home in the town of Holt on Monday on a report of an unresponsive child. The little boy was pronounced dead at a hospital. His name has not been released.

The regional major case squad is handling the investigation.

Officials have not yet released the name of the victim. There has been no official word on suspects or arrests in the homicide.