A 5-year-old girl who fell overboard off a Disney cruise ship reportedly fell backward through a porthole. The investigation is continuing into the incident that happened June 29 as the ship was returning to Fort Lauderdale after a four-day cruise.

The 5-year-old fell overboard when she lost her balance while sitting on a railing and dropped backwards down a porthole, BSO said.

The pair were rescued by crew from the Disney Dream after the father treaded water with his 5-year-old daughter for about 20 minutes, the release said. The incident happened about 11:30 a.m. Sunday when the girl “lost her balance while sitting on a railing and falling backward through a porthole,” the release said.