A 7-year-old girl who began “having difficulty in the water” while swimming in Lake Pontchartrain on Saturday afternoon died after being taken to a hospital, New Orleans police said.

The girl, whose name has not been released, was swimming with friends near the 5400 block of Lakeshore Drive about 4 p.m. when witnesses noticed the girls were having trouble, according to an NOPD news release.

The witnesses tried to help the girls to safety, but one of them was unresponsive. She died at a hospital.

The girl’s death is considered unclassified until an autopsy is complete.

NOPD child abuse detectives are investigating, the release states.