CNN is reporting that a gunman opened fire in the entrance of Washington's holocaust museum at approximately 12:50pm today.

Security personnel returned fire, wounding the gunman who had shot a security officer at his checkpoint. It is not known whether the gunman, whose name has not been released, began shooting before or after passing through the museum's metal detectors.

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Both the gunman and the security guard have been transferred to George Washington University Hospital. Their conditions are unknown at this time as is the shooter's motive for opening fire.