Authorities are investigating a fatal fire in Grundy County.

Crews were dispatched to extinguish a garage fire at 505 Oak St. in Reinbeck around 11 a.m. on Sunday (Nov. 26, 2017). After firefighters arrived and put out the blaze, they discovered a body inside the garage, sheriff's officials said.

According to authorities, the identity of the victim and the cause of death are pending an autopsy.

The State Fire Marshal's Office was notified to assist the Reinbeck Fire Department and Grundy County sheriff's officials in the investigation. The cause of the fire has not been determined.

Sheriff's officials did not have a damage estimate on the garage.