(CLEVELAND) — A 28-year-old woman has been arrested days after the bodies of two girls were found in suitcases in a field in Cleveland, police announced Thursday.

The Cleveland Division of Police did not say what charges the suspect was arrested on in connection with the suspected homicides, noting that the woman is expected to be formally charged later Thursday. Her name will be released at that point, police said.

Detectives began investigating the deaths on Monday, following the “horrific” discovery, according to Cleveland Police Chief Dorothy Todd.

An individual spotted one of the bodies inside a suitcase while walking a dog in a residential neighborhood on Monday evening and reported it to police, according to Todd.

Responding officers located a second body in another suitcase nearby, Todd said. Both suitcases were in a shallow grave in a field near a school, she said.

One of the girls is suspected to have been between the ages of 8 1/2 and 13, and the second between 10 1/2 and 14, Todd said. They have been determined to be half-siblings, the Cuyahoga County Medical Examiner’s Office said Wednesday.

It was unclear how long the girls had been at the location, just that “it was some time,” and that there were no clear indicators of the cause of death, Todd told reporters Tuesday.

“This is a traumatic event for our officers, for the community,” Todd said.

The cause and manner of death have not yet been determined, and the medical examiner’s office is continuing to work to officially identify the children, police said Thursday.

The investigation led detectives to execute a search warrant at a residence located within a block of the field on Wednesday, where they “recovered substantial evidence related to the case,” the Cleveland Division of Police said.

A person of interest was detained on Wednesday, with Cleveland Police Sgt. Wilfredo Diaz telling reporters it was a “significant break” in the case.

Todd said in a statement Thursday that “careful and methodical work” in the case “allowed our detectives to develop the evidence needed to make quick identification of a person of interest, ultimately resulting in an arrest.”

A child located inside the searched home has been taken into custody by the county’s Department of Children and Family Services, police said. The child appeared to be in good health, police said.

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