Authorities are working to identify a body firefighters found in a vacant downtown Omaha building after extinguishing a blaze.

Firefighters were called to the building near 18th and Dodge streets around 2 a.m. Thursday after smoke was reported coming from the roof.

Once the fire was put out, the body was found inside an elevator car. Authorities say they could not immediately identify even the gender of the body.

Investigators are working to determine what killed the person and what caused the fire.

The apartment building has been vacant for about five years.