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.

A ferry dock collapse on Sapelo Island shook the Gullah Geechee community on Saturday. Here's more on the Gulla Geechee people and their history.

Seven people died when a ferry gangway collapsed during a Gullah Geechee cultural event on Sapelo Island, Georgia.