The Pinal County Sheriff’s Office received a disturbing call around 11:15 p.m. on March 26. According to reports, the caller described finding two children deceased in a vehicle. The kids, a 2-year-old boy and 10-month-old girl, were both still strapped into their car seats. The devastating death of these children is still under investigation, but authorities have reason to suspect foul play.

Brittany Velasquez, the 20-year-old Arizona mother, has been charged with the murder of both children. Navideh Forghani, a spokeswoman for the Pinal County Sheriff’s Office, reported that investigators found specific evidence suggesting foul play, but authorities haven’t made the evidence public yet. A full autopsy is being conducted on both children to determine what caused their death.

Sadly, relatives of the young children reported to news groups that they had previously called the Department of Child Services on several occasions. CPS representatives and police officials had reportedly been called to the mother’s home at least eight times over the past two years. Two of these police visits were directly related to the mother’s abuse of her children, and they led to reports of potential child neglect and abuse. Despite multiple investigations, the state agency was not able to produce enough evidence to remove the babies from the mother’s care. Relatives have been concerned for the children’s safety for a long time now because they believed their mother, Velasquez, was mentally unstable.

Velasquez is currently being held in jail on a $2 million bond. She was arrested on suspicion of two charges of first-degree murder.