Omaha police investigating the death of an infant say the baby girl was tossed from a second-story apartment window immediately after her teen mother gave birth to her.

Police say they were called to the eastern Omaha apartment shortly after 4 a.m. Friday, where they found a woman administering CPR to the infant. The baby and 16-year-old were taken to a hospital, where the baby was pronounced dead.

Investigators say the teen was alone in her bedroom when she went into labor and gave birth to the premature baby. Police say she then threw the infant out the window and told her mother.

The woman ran outside, found the baby in the grass and called 911.

Police say autopsy results are expected in several days, and that charges are pending.