Both people on board a small plane that crashed in southern Louisiana on Wednesday night are presumed dead, officials say.

The aircraft went down in a marshy area near a highway around 8:30 p.m. The cause of the crash has yet to be determined and is being investigated by the National Transportation Safety Board and the Federal Aviation Administration.

Lafourche Parish President Archie Chaisson told The Times-Picayune/The New Orleans Advocate that immediate rescue efforts after the crash were challenged by the marshy terrain. By Thursday morning, officials made it to the wreckage site by airboat. Much of the plane was under water.

Only two people were aboard the plane. Lafourche Parish Sheriff's Office Capt. Brennan Matherne confirmed initial media reports to The Associated Press that both people were presumed dead.

Additional details, including the identity of the victims, were not immediately available.

Newsday Live and Long Island LitFest present a conversation with James Beard Award–winning chef, restaurateur and New York Times bestselling author Michael Symon. Newsday’s Elisa DiStefano hosts an in-depth discussion about the chef’s life and new book, “Symon’s Dinners Cooking Out,” with recipes for simple dinners as well as entertaining a crowd.

Newsday Live Author Series: Michael Symon Newsday Live and Long Island LitFest present a conversation with James Beard Award–winning chef, restaurateur and New York Times bestselling author Michael Symon. Newsday's Elisa DiStefano hosts an in-depth discussion about the chef's life and new book, "Symon's Dinners Cooking Out," with recipes for simple dinners as well as entertaining a crowd.

Newsday Live and Long Island LitFest present a conversation with James Beard Award–winning chef, restaurateur and New York Times bestselling author Michael Symon. Newsday’s Elisa DiStefano hosts an in-depth discussion about the chef’s life and new book, “Symon’s Dinners Cooking Out,” with recipes for simple dinners as well as entertaining a crowd.

Newsday Live Author Series: Michael Symon Newsday Live and Long Island LitFest present a conversation with James Beard Award–winning chef, restaurateur and New York Times bestselling author Michael Symon. Newsday's Elisa DiStefano hosts an in-depth discussion about the chef's life and new book, "Symon's Dinners Cooking Out," with recipes for simple dinners as well as entertaining a crowd.

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