Authorities in northern Wisconsin say the three people killed in the crash of a medical helicopter were flight crew members.

Oneida County Sheriff’s Chief Deputy Dan Hess says the wreckage was found early Friday.  He says no patients were on board teh Ascension Health Spirit helicopter when it crashed in Hazelhurst, a small town about 150 miles northwest of Green Bay.

A search was launched after the chopper was reported missing late Thursday night.

The Federal Aviation Administration says the helicopter left Madison and was on its way to Woodruff when it crashed about 12 miles south of its destination.  The FAA is sending a team to help with an investigation led by the National Transportation Safety Board.