Firefighters extinguished what they determined to be an intentionally set fire early Sunday morning. The blaze caused $6,000 in damage to 1240 Superior St., a vacant home set to be razed by order of the city, according to a Racine Fire Department release. The fire was set to the rear of the house at about 5:45 a.m. Sunday and was brought under control in 15 minutes. It’s unclear how investigators determined the fire was set intentionally. According to the release, anyone with information about the cause of this fire is asked to contact the Racine Fire Department at 262-635-7915.