An agent with the Federal Bureau of Investigation on Tuesday described a labyrinth of wires and potential explosives that had been rigged to be set off by a trip wire at the Aurora, Colo., apartment of James E. Holmes, who is charged with opening fire inside a crowded movie theater this summer, killing 12 people and injuring dozens of others.

The agent, Garrett Gumbinner, said that Mr. Holmes told the authorities after his arrest that he had hoped an explosion at his booby-trapped apartment would divert law enforcement officers from the movie theater, where Mr. Holmes had gone armed with a semiautomatic rifle and two other firearms.

“He said he had rigged his apartment to explode or catch fire in order to send resources to the apartment rather than the theater,” Mr. Gumbinner said.

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