The Metropolitan Police Department says they have made an arrest in relation to the homicide of an infant boy last week in Northeast D.C.

According to a press release, police arrested the mother of the infant, 26 year-old Sosefina Amoa, yesterday and charged her with a first degree felony murder charged after the Office of the Chief Medical Examiner ruled the infant’s cause of death to be asphyxiation in the manner of homicide. The death occurred on October 11 in the 4200 block of Harewood Road NE.

The police report states that on that day “a woman brought an unconscious infant male to a local hospital where he was subsequently pronounced dead.” It should be noted that this incident is different than the death of a two-week-old baby girl, which occurred on the 5100 block of Just St. NE on October 10, just a day prior to this incident. An MPD public information officer tells DCist that the investigation into the cause of death of that infant girl is still ongoing.

UPDATE: NBC4 reports that Amoa, who was training to become a nun, didn’t know that she was pregnant. Amoa, who was living and receiving religious training at Little Sisters of the Poor in Northeast D.C., didn’t know she was pregnant when she gave birth to the baby boy and later suffocated him while trying to keep him quiet so the other nuns would not hear the baby:

According to police documents, Amoa began experiencing contractions in her room at the convent last Thursday, Oct. 10 and “felt like something was coming out of her stomach.” She said while she was leaning on her bed about 15 to 20 minutes later, the baby was born and fell straight down, hitting the floor, the documents say.

During a second interview with police six days after the baby’s death, Amoa told officers that she covered the newborn’s face because she was scared the nuns would hear him crying.

“She said that she placed a black wool garment over the child’s nose and mouth and applied pressure with her hand for two to three minutes,” the documents say.

Authorities also said that she kept the baby in her room overnight, tried to clean up all evidence that she had given birth, and then told the other nuns that she found the baby outside, before admitting that it was indeed hers.