ROTHBURY, Mich. – An investigation is underway after one person died during the Electric Forest Music Festival, an event which draws tens of thousands of people each summer.

The person who died was a 20-year-old volunteer from Caledonia.

The Oceana County Sheriff’s Department told FOX 17 News Monday morning there were 20 arrests related to the festival. Fourteen of the arrests were made on site.

The following is a news release sent by Michigan State Police:

The Michigan State Police Hart Post and the Oceana County Medical Examiner’s Office are waiting for the results of an autopsy conducted on Brian Alan Brockette , a 20 year old, Caledonia, Michigan, man. The victim suffered a medical emergency on Sunday, June 29, 2014, at approximately 11:15pm, and subsequently passed away. The victim was a volunteer for an outside vendor at the Electric Forest Festival. The incident remains under investigation by the Michigan State Police.

The Oceana County Medical Examiners Office will complete their investigation after receiving the final autopsy report. Questions about the medical response are to be directed to the Electric Forest Festival promoters, who contracted for medical services. The final autopsy report will be sent to the Oceana County Medical Examiner’s Office, and questions concerning those results should be directed to their office. No further information is available at this time.