TRONA — A 39-year-old man and former citizen volunteer who allegedly sexually assaulted an underage girl was arrested Tuesday, authorities said.

Edwin Michael Funke, of Trona, was arrested Tuesday after an investigation linked him to the crime. San Bernardino County Sheriff’s Department officials said Funke, a former citizen volunteer at the Trona Sheriff’s Station, sexually assaulted a 14-year-old girl.

The investigation began when Sheriff’s detectives received information about an “inappropriate relationship” between Funke and an underage girl. The girl told detectives that Funke sexually assaulted her at his home “on several occasions” last year, authorities said.

Together with the Sheriff’s Crimes Against Children Detail, Trona Sheriff’s Station detectives investigated the claims and Funke was arrested on suspicion of oral copulation and lewd acts with a child on Tuesday.

Funke remains in custody at the High Desert Detention Center in lieu of $50,000 bail, authorities said, and is scheduled to appear in court at 12:30 p.m. Thursday.

Funke was a Citizen Volunteer at the Trona Sheriff’s Station since October of 2014, authorities said, but is no longer affiliated with the department.

Funke was also a paid call firefighter at San Bernardino County Fire Department’s Station 57 in Trona, according to County Fire spokeswoman Tracey Martinez, but has been suspended "pending the outcome of the criminal investigation."

The investigation is ongoing, and anyone with information is urged to contact Detective M.J. Higgins with the Crimes Against Children Detail at 909-387-3615. Persons wishing to remain anonymous can contact the We-Tip Hotline at 1-800-782-7463 or online at www.wetip.com.