At least 7 killed, several injured in dock collapse on Georgia's Sapelo Island

At least seven people were killed and several more injured Saturday afternoon after part of a ferry dock collapsed on Georgia's Sapelo Island, authorities said.

At least 20 people went into the water when the gangway collapsed at about 4:30 p.m. local time on the Marsh Landing Dock, the Georgia Department of Natural Resources, which operates the dock, said in a statement provided to CBS News.

At least seven people were believed to have been killed and "an unknown number" were hurt, the agency said.