Authorities say two adults and their four-year-old child have died in a mobile home fire in southwest Virginia.

Grayson County Sheriff Richard Vaughan said in a news release that the adult victims in Monday's blaze near Galax were identified as 39-year-old Larry Stephen Lafferty and 28-year-old Amy Stoneman. The identity of their daughter was not available.

Authorities say firefighters had to force open the doors on the mobile home when they responded to the fire about 8:15 a.m. Monday. The victims were all inside.

Police say the cause of the fire hasn't been determined, but they do not suspect foul play.

The victims' bodies will be sent to the medical examiner's office in Roanoke for autopsies.