Authorities have identified two brothers found dead following a fire at an Ionia County mobile home.

The Grand Rapids Press reports Wednesday that autopsies determined 51-year-old Steven Smith and 47-year-old Thomas Smith died as a result of the fire.

The Sentinel-Standard of Ionia and The Grand Rapids Press report firefighters responded to the fire Tuesday afternoon.

The home in Boston Township, located about 25 miles east of Grand Rapids, was engulfed in flames when firefighters arrived.

Sheriff's Sgt. William Hoskins says investigators haven't yet determined what caused the fire or where it began. Foul play is not suspected.