A white supremacist with a long history of anti-Semitic activity is in custody today after opening fire at the Holocaust Memorial Museum in Washington, DC, killing a security guard and wounding another. The gunman, eighty-eight-year-old James W. von Brunn, was critically injured after other guards returned fire. The slain security guard, Stephen Johns, was thirty-nine years old. Washington, DC Mayor Adrian Fenty said police believe von Brunn acted alone.

Washington, DC Mayor Adrian Fenty: “In these days and times, you never know when someone is going to grab a gun and use it in an inappropriate way, as was done today. But we want to thank the heroism of the security guards, the Metropolitan Police Department, for being on hand very early to make an arrest. We believe we have someone who was a lone gunman, but we’re going to spend the night investigating any and all other leads.”

The attack marks at least the third recent shooting involving a gunman with ties to the white nationalist movement.