KNOXVILLE, Tenn. -- The Knoxville Police Department says a mother is charged with first degree murder following the death of her 3-month-old baby.

KPD says 3-month-old Adrian Prince Howell, Jr. died from blunt force trauma to his head. While officers are still investigating the incident at 1100 Lula Powell Drive, they say there is no evidence of a shooting or that a weapon was involved.

Officers say the baby's mother, 19-year-old Tierra Patrice Williamson, will be detained on a $100,000 bond after she is discharged from the hospital. She is charged with one count of first degree murder, according to KPD.

ORIGINAL STORY: A woman is in custody after she held a 3-month-old baby over the third-floor railing of an apartment building and threatened to kill the infant, according to Knoxville Police.

Officers were called to the Townview Towers Apartments, at 1100 Lula Powell Drive, near downtown shortly before 8:20 p.m.

A KPD spokesperson said 911 callers initially thought a shooting had occurred, but police have not been able to determine whether any gunshots were fired.

KPD spokesperson Darrell DeBusk said officers found the injured baby boy inside the apartment. The baby was taken to UT Medical Center. DeBusk said they are not releasing any information about the baby's condition at this time.

The woman is also being treated at UT Medical Center, and will be interviewed by investigators, DeBusk said.

Officers are also interviewing a male witness at the Safety Building.

DeBusk said officers are working to obtain a search warrant for the apartment. They don't have any preliminary information about a motive.

DeBusk said they would not confirm the relationship between the woman and the baby boy at this time. The woman is a resident of the Townview Towers apartment building.

This story will be updated when more information is available.