SHOOTING AT HOLOCAUST MEMORIAL MUSEUM…. A scary scene in Washington, D.C., this afternoon.

A gunman exchanged fire with security guards inside the U.S. Holocaust Memorial Museum on Wednesday.

U.S. Park Police Sgt. David Schlosser said the gunman walked into the museum with what he described as a “long gun.” The gunman and a security guard were shot. Both were taken to the hospital, but the extent of their injuries wasn’t immediately known.

U.S. Park Police initially gave slightly different information, saying three people had been shot. Fire department spokesman Alan Etter told CNN a third person was hurt after being cut by broken glass. Several witnesses said they saw the security guard on the floor and bleeding.

An NBC News report, citing law enforcement officials, identified the suspect as James Wenneker von Brunn, an 88-year-old Maryland resident*. The report added that von Brunn “may have had connections to hate groups or anti-government groups.”

Dana Goldstein added that the suspect runs a white-supremacist website, which includes a biography that says von Brunn spent over six years in federal prison for attempting “place the treasonous Federal Reserve Board of Governors under legal, non-violent, citizens [sic] arrest.” Goldstein also noted that the suspect has authored a pamphlet entitled, “Kill the Best Gentiles: A new, hard-hitting expose of the JEW CONSPIRACY to destroy the White gene-pool.” He has also written that “Hilter’s worse mistake” was that “he didn’t gas the Jews.”

* corrected

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Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.