Multiple fire departments respond to a residential structure fire that damaged two residences in the 700 block of Eletson Drive in Crystal Lake early Wednesday morning. | Photo: Tyler Tobolt / Lake and McHenry County Scanner

A dog is missing and two families have been displaced after their homes were damaged by a fire that broke out in Crystal Lake early Wednesday morning, officials said.

The Crystal Lake Fire Rescue Department responded around 1:30 a.m. to the 700 block of Eletson Drive in Crystal Lake for a report of a structure fire.

Crystal Lake Fire Rescue Department Battalion Chief Rick Kaiser said fire crews arrived within six minutes to find a working structure fire.

Flames and smoke were visible from an attached garage of a residence.

Multiple fire departments respond to a residential structure fire that damaged two residences in the 700 block of Eletson Drive in Crystal Lake early Wednesday morning. | Photo: Tyler Tobolt / Lake and McHenry County Scanner

The residence was attached to three other homes. Kaiser said all residents and animals evacuated their homes prior to the fire department’s arrival.

Firefighters made an aggressive attack on the fire, which had spread to the attic, Kaiser said.

An adjacent residence also sustained damage. The two residences were deemed uninhabitable.

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The American Red Cross is working with the residents to provide housing for both families, Kaiser said.

Multiple fire departments respond to a residential structure fire that damaged two residences in the 700 block of Eletson Drive in Crystal Lake early Wednesday morning. | Photo: Tyler Tobolt / Lake and McHenry County Scanner

No firefighters or occupants were injured during the incident.

The Crystal Lake Police Department said CoCo, a 35-pound Australian Shepherd mix, went missing from the fire and was last seen around Berkshire Drive between Coventry Lane and McHenry Avenue.

The Algonquin-Lake in the Hills Fire Protection District, Huntley Fire Protection District, McHenry Township Fire Protection District, and Woodstock Fire Rescue District assisted on the scene.

The Crystal Lake Police Department, Crystal Lake Public Works Department, ComEd and Nicor Gas also responded.

The cause of the fire remains under investigation by the Office of the Illinois State Fire Marshal, Kaiser said.