Police used it to communicate with Dykes along with the telephone inside the bunker and the hatch door. After the rescue, authorities found the pipe packed with explosives along with another explosive inside the bunker itself, authorities said.

Police said Dykes was "contentious" the entire time, but he allowed them to deliver comfort items for Ethan including coloring books and toys.

While they were negotiating with him, officials told the media Dykes used an electric heater and blankets to keep the boy warm.

As the outside world waited to learn what was unfolding inside that bunker, rescue teams found a way to see inside.

Somehow, somewhere, they slipped a camera into the hideout, a law enforcement official said.

On Sunday things began to change. Negotiators sensed a change in Dykes' demeanor. But what they saw through the camera was what made them decide to storm the bunker and rescue the boy on Monday: Dykes was holding a weapon.

That's when federal agents, who had been practicing rescue missions in a wooden replica of the bunker, detonated large explosions and two agents dropped into the bunker and fatally shot Dykes, sources told CNN.

Ethan, who celebrated his birthday shortly after the rescue, was unharmed. It was all over in seconds.

The bunker is set to be destroyed after all the evidence is removed, Dale County Sheriff Wally Olson said.