GROTON -- A two-alarm fire Monday morning in a ranch-style home on Nashua Road left the structure uninhabitable, according to Groton Fire Chief Steele McCurdy.
Multiple calls for the fire at 244 Nashua Road came in at around 11:10 a.m. and emergency personnel arrived about five minutes later. There were no injuries.
"On arrival we found a very heavy amount of fire on the second floor of a split-level home with some collapse that was already occurring," McCurdy said at the scene Monday afternoon.
McCurdy said the homeowner, the only resident there, was not home at the time of the fire.
Ayer, Littleton, Westford, Dunstable, Pepperell, Townsend, Tyngsboro and Devens all responded for assistance. The fire was extinguished in about an hour.
"The cause of the fire is still under investigation at this point," McCurdy said.
Follow Kori Tuitt on Twitter @KoriTuitt