BATON ROUGE, La. (BRPROUD) — The sheriff’s office says a four-year-old girl died in a Thursday night drowning and a three-year-old boy is in critical condition.

Deputies responded to the Regency Club Apartments at 7:18 p.m. where the children were found by family members in a pool. The East Baton Rouge Sheriff’s Office said CPR was performed on both children before being taken to the hospital.

The children’s mother told deputies that the girl and boy left the apartment without her knowledge after she fell asleep.

An investigation is ongoing.