(CNN) For the latest developments on the duck boat sinking, please click here.

A duck boat capsized and sank during a severe thunderstorm in Missouri, killing at least 11 people, some of them children, authorities said.

Stone County Sheriff Doug Rader said 31 people were aboard the boat during Thursday night's incident on Table Rock Lake near Branson. Six people are unaccounted for and 14 survived, he said.

Video posted by Jennie Phillips-Hudson Carr and shot from a nearby larger vessel showed two duck boats rocking and tilting to the side as the lake's ripples turned into massive waves.

"Oh my God, those poor people, oh no!" someone says in the background as the water crashes into the bobbing boats.

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