This from Asher Heimermann:

The Milwaukee Fire Department responded to a house fire near North 24th Street and Garfield Avenue around 1:30 AM on Friday, December 24th. Originally reported as a rubbish fire, first arriving firefighters found a house on fire. 
 
As firefighters worked to extinguish the blaze, the roof collapsed. No injuries were reported at the scene and there is no word if anyone was home at the time.