Mesa County sheriff's deputies received a report about a backpack filled with bombs and bomb-making materials being found outside the Racquet Club apartment complex in Grand Junction Sunday afternoon, The (Grand Junction) Daily Sentinel reported.
The apartment complex was evacuated while the police bomb squad went through the backpack, removing items and placing them into disposal units.
The items removed from the backpack included bottles and canisters filled with gunpowder, and sealed with duct tape, and fuses, police said.
A Grand Junction Police Department spokesman said the items were "homemade," but didn't say whether they were capable of exploding.
As of Sunday night, no arrests had been made and police did not confirm whether they were pursuing any suspects.