Firefighters respond to a structure fire at The Mulch Center, 12660 Bittersweet Avenue in North Chicago, that left an unoccupied building destroyed Saturday evening. | Photo: Willie Gillespie (@wgweather)

Authorities are continuing to investigate a fire that caused an unoccupied building to be fully engulfed in flames at a mulch supplier in North Chicago Saturday evening.

The North Chicago Fire Department and North Chicago Police Department responded around 7:20 p.m. Saturday to the area of Bittersweet Avenue west of Route 41 in North Chicago for a report of a structure fire.

Fire crews arrived and reported a single-story building at The Mulch Center, 12660 Bittersweet Avenue, was fully engulfed in flames, according to fire radio traffic.

Firefighters respond to a structure fire at The Mulch Center, 12660 Bittersweet Avenue in North Chicago, that left an unoccupied building destroyed Saturday evening. | Photo: Willie Gillespie (@wgweather)

There were no other structures immediately nearby and the fire completely destroyed the building.

North Chicago Fire Department Lieutenant Herrera told Lake and McHenry County Scanner that the structure was newly built and unoccupied at the time.

No injuries were reported and it is unclear yet what caused the fire.

[Suggested Article]  Lawnmower believed to have started fire that prompted response of dozens of fire departments in Lakemoor

The investigation is ongoing, Herrera added.