WASHINGTON (CNN) -- The FBI says it found child pornography on a computer used by the man charged with the fatal shooting of a security guard at the U.S. Holocaust Memorial Museum June 10.

Museum shooting suspect James von Brunn remains in a Washington hospital.

In court documents filed Wednesday, an investigator says the pornography was found on a desktop computer during a search of an Annapolis, Maryland, apartment where 88-year old James von Brunn had been living for the past two years. The documents did not provide details about the pornography, but investigators requested permission to make a more extensive search of the computer and others found in von Brunn's home.

Von Brunn has been charged with the murder of museum security guard Stephen Johns. The white supremacist was shot in the face after two other security officers returned fire. He remains in a Washington hospital.

The FBI also searched a red Hyundai that law enforcement officials say von Brunn left double-parked in front of the museum right before the shooting. In separate documents also filed on Wednesday, investigators say they found 35 rounds of live ammunition for a .22 caliber rifle. Officials allege von Brunn used a .22 caliber rifle, which was found at the scene, to shoot Johns in the chest.

According to paperwork detailing the car search, investigators found business cards advertising a USS Liberty Web site that claims Israeli forces "suddenly and brutally" attacked the U.S. Navy vessel in international waters in 1967. Investigators also found business cards for von Brunn's own Web site, which hosts postings of white supremacist writings.

Among other items found in the car were a disabled parking permit, mouthwash, a salt shaker and a roll of quarters totaling $7.25.

Earlier this week investigators filed papers saying among the items discovered in von Brunn's apartment was a painting that appeared to depict Hitler and Jesus. They also found a .30-30 rifle, ammunition and a handwritten will.

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