Two people working on powerlines near the Mississippi River died Thursday when their helicopter hit the lines, crashed into a barge and sparked a fire that belched plumes of black smoke, officials said.

The helicopter crew was near East Alton, about 20 miles (32 kilometers) north of St. Louis, when it careened into the barge on the Missouri side of the river. Authorities said no other injuries were reported.

Adam Briggs was on the opposite shore when it all happened and filmed the crash scene.

“The helicopter was just working on these power lines, it hit the power line, blew up,” he said in the video as flames flashed through the rolling smoke. “There was a pilot, there was a worker, the helicopter blew up and fell and crashed in that barge and it’s exploding right now.”

“They’re dead.

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