Firefighters battled a pair of overnight house fires on the near-north side of Indianapolis. The first was near 18th Street and Massachusetts Avenue—where firefighters also extinguished a blaze over the weekend. Just after that fire started, firefighters were called to another house less than a mile away on Holloway Avenue just north of I-70. Both houses are thought to have been vacant. Fire investigators are looking into both incidents to see if arson was likely.