Lansing firefighters are investigating a late-night fire on the 900 block of East Saginaw Street.
Eric Weber of the Lansing Fire Department says it happened on the first floor of a home that is being renovated after a fire from last week. The cause of that one is still under investigation.
He says there is extensive damage on the home's interior; firefighters had to rip through many walls because smoke traveled through them up to the attic.
It also caused heat damage to a home next door.
No one was hurt, and no one was home at the time.