The home of Johnny Manziel’s grandfather caught fire Wednesday morning, with Smith County (Texas) Fire Officials calling in K-9 units to investigate.

KLTV called the fire “suspicious,” but did not list why.

Fire Marshal Jay Brooks told KLTV that the home, located east of Lake Tyler, went up in flames before 1:30 a.m., with the Smith County dispatch receiving a 911 call from a neighbor about the structure fire.

The home had not been occupied for at least two days, and collapsed at 2 a.m.

Per KLTV, the Smith County Appraisal District put the market value on the 3,600 square foot home, registered to Paul Manziel, at $408,438. The home was built in 1975.

The K-9 unit is expected by noon.