A horse trailer next to a barn that burned down Tuesday was found fully involved when firefighters were called back to the site Saturday, a Harvard Fire Protect District official said.

Firefighters were called to the 9200 block of White Oaks Road about 12:15 p.m. Saturday, Battalion Chief Bryan Pierce said.

The horse trailer fire was under control in about five minutes but firefighters remained on site to put out hot spots.

The barn, which was a total loss following the earlier fire, was no longer smoldering, Pierce said.

The McHenry County Sheriff’s Office also responded to the fire and is investigating.