Authorities are working to identify the cause of a partial ferry dock collapse on Georgia’s Sapelo Island that turned a day of celebration into tragedy, leaving at least seven dead and six critically injured as crowds gathered for a cultural festival.

Dock collapse on Sapelo Island About 700 visitors were in attendance at Sapelo Island, about 60 miles south of Savannah, before the collapse which tragically killed seven people and left three in critical condition.

Hundreds were visiting Sapelo Island in Georgia for a fall festival spotlighting the history and culture of its tiny Gullah-Geechee community.