BOSTON (AP) — Human remains found at a Boston apartment building earlier this month are those of four infants, police said.

The remains are of two boys and two girls, Boston police said in a statement posted on the department's website Monday. No arrests have been announced and an investigation is ongoing.

Officers originally responded to the building Nov. 17 and found what appeared to be human remains. The next day they found more.

The Suffolk district attorney’s office previously confirmed that some of the remains were found in a freezer.

They were removed by the Office of the Chief Medical Examiner, and were determined to be the remains of four infants, police said. Autopsy results are pending.

Police and the Suffolk district attorney's office are continuing to investigate. No additional details were made public.

ByHeart has voluntarily recalled five batches of its infant formula due to the potential cross-contamination with Cronobacter sakazakii.

According to the Food and Drug Administration (FDA), Cronobacter bacteria can cause sepsis or meningitis. It may also cause bowel damage, the FDA warns.

The recall was made out of an abundance of caution as there have been no reports of illness linked to the baby formula.

The recalled products were sold in 24 oz. containers with a label that says Whole Nutrition Infant Formula, Milk Based Powder with Iron. The formula is for infants 0-12 months.

Consumers should check under the can for recalled batch numbers 22273 C1, 22276 C1, 22277 C1, 22278 C1, and 22280 C1 that are printed with use by 01 JAN 24 or 01JUL 24 date.

"If a baby has already consumed all of the formula, there is no reason for concern, and no additional action is needed," a statement on the FDA's website states. It adds that parents should contact their child's pediatrician with any concerns.