Authorities are investigating 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.

Georgia Department of Natural Resources Commissioner Walter Rabon said Sunday morning that at least 40 people were on the gangway and that half fell into the water. The dock gave way before 4 p.m. in a "catastrophic failure," prompting a response from the Coast Guard and state and local agencies.

The "catastrophic failure" of an aluminum ferry gangway caused the deaths Saturday of seven people who were attending an annual cultural event on historic Sapelo Island off the coast of Georgia, officials said Sunday.

Georgia authorities say they are investigating the “catastrophic failure” of a dock gangway that collapsed, killing seven on Sapelo Island.

There were life jackets bobbing in the water, people forming a human chain to pass survivors to safety and dead bodies being carried asnore in blankets

The gangway collapsed Saturday as festival goes prepared to board a ferry amid Sapelo Island's annual Cultural Day, officials say.

A crowd had gathered for a celebration of the Gullah Geechee people, who have inhabited Sapelo Island since enslaved people were forcibly brought from Africa to the U.S.

Bystanders and rescue teams searched for victims after the gangway at a ferry dock in Sapelo Island collapsed into the water.

ATLANTA − At least seven people were killed after part of a boat dock collapsed, sending at least 20 into the Atlantic waters off the coast of Georgia on Saturday. U.S. Coast Guard ships were searching through the night for missing people.