UPDATE: Missing 15-year-old Tacoma mother and baby found safe in Seattle

TACOMA -- A 15-year-old girl who ran away from foster care with her 5-month-old baby after learning they would be separated and triggered an 'endangered persons' alert were found safe in Seattle at her boyfriend's home, Tacoma police said Wednesday night.

Police said they will be transported back to Tacoma where Child Protective Services will place them together in a foster home for the night.

Authorities said the mom, Keymani Kirby, had been with her young son together in foster care. Kirby learned they would be separated Wednesday, officials said. Rather than face separation, Kirby ran away with her baby, police said.

An Endangered Missing Person Advisory was issued following their disappearance.

Tacoma Police Department's public information officer, Loretta Cool, explains why the alert was issued in the video below: