A pilot and two medical workers have died following an air ambulance crash in northern Wisconsin overnight.
The Oneida County Sheriff's Office confirmed that the crashed Ascension Health Spirit Medical Transport was found near the town of Hazelhurst,, after it had been reported missing around 11:20 p.m.
The National Transportation Safety Board (NTSB) and the county sheriff confirmed that the pilot of the Eurocopter AS350 and two medical staff on board died in the crash.
WJFW reports that the air ambulance was returning to Woodruff from Madison after dropping off a patient when the crash happened.
Woodruff is north of Hazelhurst, with officials saying the 'copter crashed about 12 miles south of its final destination.
The NTSB and Federal Aviation Administration (FAA) are investigating the crash, a cause of which has yet to be determined.
The last prominent fatal crash involving a Eurocopter AS350 happened in New York City in March, when a sightseeing helicopter crashed in the East River, killing five.