State officials say a 15-year-old girl left at an Omaha hospital is the 21st child abandoned under Nebraska's unique safe-haven law.

The Nebraska Department of Health and Human Services' Todd Landry says the girl from Douglas County, Neb., was left Monday evening at Creighton University Medical Center.

Landry says the girl will remain in a residential shelter while her situation is investigated.

Nebraska's safe-haven law, which took effect in July, is the only one in the country that lets caregivers abandon children as old as 18 without fear of prosecution.

Most state lawmakers have agreed to amend the law when the Legislature reconvenes in January so that it applies only to infants up to 3 days old.