A U.S. military tank takes a position outside the Iraq National Museum in Baghdad in an April 16, 2003, photo.

Built in 1966, the museum housed antiquities from the Stone Age as well as artifacts from the ancient Sumerian, Babylonian, and Assyrian civilizations.

But after the U.S. invasion five years ago, the museum became a target for looters—among them museum employees and government officials. (See photos of some of the treasures once housed in the museum.)

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