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5 Colorado Teens Accused of Ambushing Officer with Chlorine Bomb

Officer Grahn and a civilian worked to clear the street when they were attacked with the chemical device. The gas reportedly caused the officer to lose consciousness.

April 10, 2019

Arvada police arrested four men and a juvenile in connection with a chemical bomb that injured an officer and another man in west Arvada , police said.

The five teens are accused of throwing a homemade chlorine bomb at the officer and another man, who had stopped to clear a street of a barricade made from road signs and plastic wrap, according an Arvada Police Department arrest affidavit.

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Within 24 hours of the attack, Maxwell McCann, 18; Braiden Ulmer, 19; Isaac Koch, 19; Gavin Dawson, 19; and an unnamed juvenile were arrested on suspicion of first-degree assault; criminal attempt of second-degree assault; two counts of possession, use or removal of explosives or incendiary devices; and conspiracy to commit possession, use or removal of explosives or incendiary devices.

The attack happened after midnight Saturday when an officer, identified as T. Grahn, responded to a call about the barricade on Beech Street, the Denver Post reports.

Officer Grahn and a civilian worked to clear the street when they were attacked with the chemical device. The gas reportedly caused the officer to lose consciousness.

Officer Grahn was diagnosed with a chlorine gas exposure at a local hospital. The civilian was treated at his home for minor injuries, the affidavit said.

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