Police investigating 16-year-old found dead in field near Mankato, Minn.

A death investigation is taking place after 16-year-old Hannah Oliva from New Ulm, Minn. was found lying face down in a field near Mankato on Wednesday morning.  Police are saying there were no obvious signs of trauma and it doesn't appear to be suicide, so they're calling her death "suspicious."

According to Blue Earth County Sheriff's Department, authorities received a report of a vehicle sitting in a field approximately 200 yards off of Hwy. 68 in Judson Township around 6:30 a.m.

"The responding deputy located the unoccupied vehicle, stuck in the mud, but found no one in the immediate vicinity of it," Capt. Rich Murray said. "A search of the area was conducted.  The deputy did locate an unresponsive female lying face down in the field some distance away from the vehicle."

The teen was transported to the Ramsey County Medical Examiner’s Office for an autopsy to determine an official cause of death. Oliva was a junior at Mankato West High School.

"Everyone was just sad, shocked by it," freshman student Riley Gustad said. "Kind of depressing mood all day."