GREENWOOD, S.C. -- Three people injured in a deadly weekend fire in Greenwood remain in critical condition at a Georgia hospital.

Fire officials are still investigating the cause of the Greenwood fire that killed 3-year-old Arian Makins and 4-year-old Alisha Makins.

Hospital spokeswoman Beth Frits said a 12-year-old, a 1-year-old and the children's mother, Chrystal Reed, were in Joseph M. Still Burn Center in Augusta, Ga. on Monday. They had been flown to the facility after the Saturday afternoon fire.

The State Law Enforcement Division arson investigation unit has been called in to help with the case. Authorities say the home did not have smoke detectors. Authorities have told FOX Carolina News that foul play was not suspected.

Coronaca Fire Department said the fire broke out around 4 .m. Saturday. Firefighters who were first on scene said the house was fully engulfed. It took close to 30 firefighters to get the blaze under control.

Neighbors of the family told FOX Carolina they were in shock. They said Chrystal Reed and her children just recently moved into the neighborhood. Neighbors FOX Carolina talked to said they will come together as a community and help this family in way possible.

Stay with FOX Carolina News for the latest on this developing story.