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Aurora Mayor Steve Hogan said on ABC’s “This Week” that Mr. Holmes hadn’t given any hint of the rampage he is suspected of embarking on.

“He just by every standard appeared normal,” Mr. Hogan said. “He did have friends. He had made connections. He had people he went drinking with on Friday nights.”

Calling his state “heartbroken,” Mr. Hickenlooper called Mr. Holmes “clearly deranged, twisted, demonic in some way,” saying his goal was to create terror.

• Dave Boyer contributed to this report.