The White House says the compound that housed Osama bin Laden in Pakistan was "extraordinarily unique" and had many signs that indicated he was hiding there.

The structure, which has been described as a mansion, was on a "large plot of land" in a "relatively secluded" area, a senior administration official told reporters on a conference call. The residence itself was "eight times larger" than other homes in the area, said the official, who refused to be identified.

"We were shocked by what we saw," the official said after President Obama announced that bin Laden had been killed at the compound in Abbottabad.

The security measures at the compound were "extraordinary," the official said, describing walls that were 12 to 18 feet high and topped with barbed wire, in addition to walls on the inside. Access to the mansion was restricted with two security gates, officials said.

Another sign was that the residents of the mansion burned their trash, unlike their neighbors, who simply put their garbage outside, they said.

The property, valued at $1 million, had no telephone or Internet access, the White House said. It was "custom built to hide someone of significance," the official said.

Everything that American intelligence gatherers saw, including "extremely elaborate" security, was "perfectly consistent with what our experts expected bin Laden's hideout to look like," the official said.

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