A controlled detonation inside the Aurora, Colo., apartment of James Holmes, the man arrested in a mass shooting that killed 12 people and injured 58 more, took place about 11:40 a.m. MT Saturday.
Police said an air horn would be sounded three times before the blast, but none was heard from the media area outside the apartment.
Police said the detonation at suspect James Holmes' apartment was successful.
The detonation came a couple of hours after crews were able to defuse a trip wire, the first of several steps to clear the apartment in a methodical way, Aurora police Sgt. Cassidy Carlson said.
Authorities said earlier the second phase of the disarming of the apartment could include the controlled detonation of another triggering mechanism.
Peoria Street in Aurora, Colo., was shut down, and a reverse 911 call was be sent to nearby residents prior to the detonation.
Carlson said earlier Saturday that authorities are mindful of keeping the detonations safe and have fire crews on standby to handle any fire that erupts.
Some materials in the apartment will be removed and disposed of in a separate controlled detonation. There is no timetable for the detonations.
Crews are also trying to preserve as much evidence in the suspect's apartment as possible.
Police still aren't completely sure about everything they will find in the apartment.
Police said suspect James Holmes told them that after his arrest in the shootings at Century 16 that he had placed explosives in the apartment.
Police evacuated the building and used a fire truck ladder to reach and break the windows into suspect James Holmes' apartment.