A 21-year-old mother of four whose children died in a mobile home fire was charged Friday in connection with their deaths.

Darlington County sheriff’s deputies arrested Hope Hawkins of Hartsville, S.C., on Thursday, a day after her children ages 10 months to 4 years old were found dead from smoke inhalation in a closet in a bedroom after her kitchen caught fire.

She did not arrive at home until firefighters arrived at the scene and put out the fire, investigators said. It took firefighters less than 10 minutes to put out the fire.

Hawkins was first charged with one count of unlawful neglect of a child Thursday. Hours later, Sheriff Wayne Byrd added three more counts of that charge. On Friday, Hawkins was charged with four counts of homicide by child abuse.

Sisters Myasia and Kynasia Hawkins, 10 months; and their brothers, Camaron Mason, 2, and Delonta Dixon, 4, died Wednesday.

The fire broke out on a street lined with mobile homes near Hartsville, a city of 8,000 people about 60 miles east of the state capital of Columbia.

The fire appears to be accidental, Byrd said. But Hawkins has given conflicting stories on where she was when the fire started.

Read more: USA Today