Miami ( CNN ) -- State investigators concluded there were `` no safety threats '' at the home of a 10-year-old girl two days before she was found dead in her adoptive father 's pick-up truck near her seriously ill twin brother , according to a report released Monday by Florida child welfare authorities . Both of the twins ' adoptive parents -- mother Carmen Barahona and father Jorge Barahona -- are charged with first-degree murder in the girl 's death . They also each face seven counts of aggravated child abuse and seven counts of child neglect , with the mother being so charged Saturday and the father charged on all the counts Monday . James Loftus , director of the Miami-Dade Police Department , told reporters Monday that the girl died and the boy was found only after an extended period of `` systemic long-term abuse . '' `` This is , in my experience , one of the saddest commentaries on the human condition that I 've ever seen , '' Loftus said , calling the parents ' alleged behavior `` subhuman . '' `` It 's depressing , it 's sickening . '' Jorge Barahona earlier pleaded not guilty on charges of attempted first-degree murder with a weapon and aggravated child abuse with a weapon in the case . Days before the twins were found , the Florida Department of Children and Families received tips alleging poor treatment of children at the Barahona household in Miami-Dade County . Records indicate a 7-year-old also lived in the home . One caller on February 10 claimed that the 10-year-old girl and another child had been `` tied by their hands and feet with tape , and made to stay in the bathtub all day and night as a form of punishment , '' with the tape removed only so they could eat , according to a copy of the report released Monday . Then , on February 12 , authorities began looking into another claim that one of the Barahonas ' children needed stitches after being hurt on the face and lip . Carmen Barahona applied a bandage but did n't take the child to the hospital . The mother said the child fell -- though the report notes that `` the injury is not consistent with the story . '' Investigators went to the home and late that night filed a report , in which they did not find any reasons for concern for the children 's well-being . `` There is no reason to believe that the family is about to flee or refuse access to the children , '' investigator Bridget Moore said in the `` initial in home safety assessment '' report . `` The home was observed , and there were no hazardous conditions . '' The report concluded with an assessment that the risk to the children was `` moderate , '' with no risk of abuse . `` There are no concerns for the safety of the children while in the care of the parents , '' the investigator writes . Two days later , on February 14 , authorities say Jorge Barahona parked his pest-control truck alongside I-95 . A roadside ranger said he found Barahona beside the truck and his adopted son ill inside the vehicle , which was filled with toxic chemicals . The boy was taken to a hospital to be treated for severe burns . The body of the Barahonas ' adopted daughter , Nubia -- who was the boy 's twin sister -- was later discovered in the back of the truck in a plastic bag . The Florida Department of Children and Families held its fourth of five scheduled meetings Monday afternoon to examine how authorities had handled the case . In one instance , a caller told Florida authorities that he knew the Barahonas , and he was worried about the couple 's twins . The contents of that phone call , which was made two days before the twins were found , was released last week by the department . The caller said he was worried that something sinister had happened to the 10-year-old girl because the Barahonas could not explain where the girl was . `` ( Jorge Barahona ) does n't come out with a straight answer , which is worrying me so much that something might have happened to that little girl , '' said the caller , who was not named . During Monday 's press conference , Katherine Fernandez Rundle -- the state attorney for Miami-Dade -- said the surviving children in the Barahonas ' home `` clearly are key witnesses '' in the case , describing their cooperation with investigators thus far as `` very courageous . '' Rundle said a decision has n't been made yet on whether prosecutors would seek a death sentence in this case , though she signalled that this scenario appeared likely . `` If there ever was a case that the death penalty would apply , it would seem to apply to this one , '' she said .
NEW : A Florida man , like his wife , is charged with murder and child abuse . NEW : A police director calls the behavior `` subhuman , '' pointing to `` long-term abuse '' A state investigator found no reason for concern in the household . A 10-year-old girl was found dead in plastic bag , her twin brother was burned .