Eleven people on board a boat in the Mississippi River in Wisconsin were ejected when the boat’s engine exploded, injuring eight of them, according to the Wisconsin Department of Natural Resources.

The explosion occurred Saturday in Prescott in Pierce County when authorities say the boat’s operator attempted to start the engine twice and on the third try the engine exploded.

During efforts to extinguish a blaze sparked by the explosion, the boat drifted into another boat and caused fire damage before all the fires were extinguished, officials said.

The explosion remains under investigation.

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