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.

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.