Bomb squads disarm traps at Colorado suspect's apartment

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Authorities on Saturday began disarming trip wires and explosive devices 'set up to kill' inside the apartment of the suspect in the deadly Colorado movie theatre shooting, hoping to find clues to his motive without destroying key evidence in a blast.

Federal authorities detonated one small explosive and disarmed another inside James Holmes' suburban Denver apartment, but several other explosive devices remained, said Aurora police Sgt. Cassidee Carlson.

Makeshift memorials sprang up for the 12 victims, including a U.S. navy sailor, an aspiring sportscaster and a man celebrating his 27th birthday, after police grimly went door to door with a list of those killed in the worst mass shooting in recent U.S. history. Holmes, 24, was arrested early Friday outside the Aurora theater after witnesses say he unleashed gunfire and gas canisters on a crowd of moviegoers watching the midnight showing of the new Batman film, "The Dark Knight Rises."

On Saturday, law enforcement officials began trying to disarm up to 30 devices in Holmes' booby-trapped apartment, and set off a small explosion to detonate one device.

The devices were "set up to kill that person and that could have been a police officer executing a search warrant," Carlson said. Police planned an intricate procedure to disarm the possible weapons without destroying evidence that could be in the apartment.

"We don't want to lose evidential value," Carlson said.

Federal officials said that they still hadn't determined a motive for the suspect as families grieved and others waited at hospitals, where seven of the wounded remained in critical condition on Saturday with some injuries that could be permanent.

In his Saturday radio address, President Barack Obama urged Americans to pray 'for the victims of this terrible tragedy, for the people who knew them and loved them, for those who are still struggling to recover'.