Two firefighters were evaluated by paramedics after a structure fire at a vacant building near Cary Road and North Main Street in Algonquin Friday. | Photo: Alex Vucha / Lake and McHenry County Scanner

Police and fire investigators, including the state fire marshal, are investigating after a vacant costume store in Algonquin was damaged during a fire Friday.

The Algonquin-Lake in the Hills Fire Protection District responded around 6:11 p.m. Friday to the former Fantasy Festival Costumes, located at 901 Cary Road in Algonquin, for a report of a structure fire.

Algonquin-Lake in the Hills Fire Protection District Deputy Chief John Knebl said a person driving by called 911 to report the fire.

Two firefighters were evaluated by paramedics after a structure fire at a vacant building near Cary Road and North Main Street in Algonquin Friday. | Photo: Alex Vucha / Lake and McHenry County Scanner

Firefighters arrived within five minutes to find a “large volume of fire” in the rear of the vacant structure.

Crews made an aggressive attack from the exterior and extinguished the fire in 30 minutes, Knebl said.

Two firefighters were treated on the scene by paramedics but did not require transport to the hospital.

No civilian injuries were reported.

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Two firefighters were evaluated by paramedics after a structure fire at a vacant building near Cary Road and North Main Street in Algonquin Friday. | Photo: Alex Vucha / Lake and McHenry County Scanner

The cause of the fire is undetermined and is still under investigation, Knebl said.

Algonquin fire investigators along with the Algonquin Police Department and the Office of the Illinois State Fire Marshal are investigating the fire.

A damage estimate was not immediately available.

The Algonquin-Lake in the Hills Fire Protection District was assisted by firefighters from the Carpentersville, Fox River Grove, Huntley, Crystal Lake and Hampshire fire departments.