AURORA, Colo. - An explosion occurred at the booby-trapped apartment of the man suspected in Friday's mass shooting at a Denver-area movie theater, a Reuters witness said.

In an operation called a "render-safe procedure," conducted remotely by a bomb squad, a robot placed a tube -- known as a "water shot" -- near the improvised explosive device in the apartment and backed out at a safe distance. The water shot was then detonated.

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