Police are warning there could be a controlled detonation that causes a loud boom and possibly a fire.
Bomb experts hope to soon enter the booby trapped apartment of the suspect in Friday's mass shooting at a suburban Denver movie theater.
Aurora police say the first goal is to make the area safe by removing the trip wire, which may include a controlled detonation that causes a loud boom and possibly a fire.
Authorities will alert people before that happens.
Then they plan to remove items from James Holmes' apartment that could explode, including about 30 shells that will be placed in sand trucks and taken to a disposal site.
Police say they don't have a time frame because they want to be careful and not rush.
Holmes, 24, is the suspect in a mass shooting Friday at a midnight screening of "The Dark Knight Rises." Twelve people were killed in the attack and dozens were injured, including 11 victims who remained in critical condition, authorities said.
FBI agents and police who went there discovered it was booby-trapped when they used a camera at the end of a 12-foot pole to look inside.
Aurora Police Chief Dan Oates said photos of Holmes' apartment appeared to also show jars full of ammunition and liquid and other items unlike anything the chief had ever seen.
"It's a pretty extensive booby trap. We're not sure what it's attached to. There are trip wires. There are three containers and we don't know what's inside," Chris Henderson, deputy Aurora fire chief, said previously.