MINNEAPOLIS (WCCO) — The Ramsey County attorney has a stern warning to high school students against a game that is known to take lives.

“Nerf Wars” involve shooting opponents with foam bullets for prize money. In December of 2015, two Lakeville High School Students — Johnny Price and Jake Flynn — lost their lives in a crash while playing the game.

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Last summer, two teenagers were injured after a crash police say was caused by Nerf Wars. According to investigators, the 17-year-old driver drove through a stop sign at close to 40 miles per hour before crashing.

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Ramsey County Attorney John Choi sent a letter to superintendents and principals saying in part:

“The tragedy in Lakeville taught us that what starts as a game can turn deadly in seconds. I am concerned that if we, as adults, don’t intervene and educate our students, we could face more tragedies, similar to what happened in Lakeville.”

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In the Lakeville case, no criminal charges were filed in connection to the crash. In Prior Lake, a 17-year-old driver was charged with criminal vehicular operation.