HAVERHILL, Mass. (AP) – A 2-year-old girl whose mother reported the toddler had fallen down some stairs was hospitalized in critical condition Sunday, and authorities were looking into possible child abuse.

The girl’s mother called 911 on Saturday afternoon to report her daughter had been injured from a fall, Officer William Miller said.

The girl was taken to Lawrence General Hospital, then flown to Children’s Hospital in Boston, where she remained in critical condition Sunday, Miller said. The girl’s identity was being withheld.

Haverhill police and state authorities were investigating the circumstances of the girl’s injuries.

The boyfriend of the girl’s mother was arrested Saturday on an unrelated drug count after he was interviewed by authorities about the girl’s injuries.

But there were no confirmed suspects in connection with the girl’s injuries, Miller said.

The girl’s 4-year-old sister was placed in protective state custody.