The fire at 9 Geiger Lane remains under investigation, Warren Township Police Lt. Herbert Hentschel said late on Friday morning.
Hentschel said the case has been referred to the Somerset County Prosecutor's Office.
Prosecutor's Office Spokesman Capt. Jack Bennett said only that the family was home and got out safely when the the fire began. He said there were no injuries at the scene.
Warren Township Fire Chief Michael LoSapio said firefighters arrived at that location on Thursday, answering a call that was dispatched at about 9:48 p.m., to find a confirmed working structure fire with visible flames in all directions.
The chief, on the scene, immediately requested a second alarm assignment which was escalated to a third alarm.
The fire took approximately 60 minutes to place under control, LoSapio said. He too said there were no department or civilian injuries.
Early Friday afternoon, LoSapio said the cause is still under investigation.
He said the fire brought out not only the Warren Township Fire Department, but also firefighting organization from Green Brook, Martinsville, Liberty Corner, Watchung and Finderne.
EMS support was provided by Liberty Corner, Martinsville and Warren Rescue Squads, LoSapio said. Standby units from Bound Brook, Millington and Green Knoll were at the Warren firehouses, and North Plainfield and Berkeley Heights were standing by at their headquarters, the chief added.
Burglary, theft, also reported in Warren Twp. on Thursday night
Warren Township police also reported they also responded on Thursday at about 8:55 p.m. that a home on Geiger Lane where a burglary had been reported. The police report said an unknown person had gained entry through a rear door. The value of items was not specified, and a police report was filed.
Also, Warren Township police said that at 6:28 p.m. on Thursday, a Charles Road resident reported a theft of a Yamaha Quad, two barbecue grills and three fishing poles. The combined approximate value of the items was $3,500, according to the township police report.