"They tried to get into my home," said the victim, who asked that he not be identified because it might attract more such visitors. "They wanted to know if I had any pictures. They said they didn't believe the event took place."

The victim said that when he pressed the visitors for identification, one of them presented a business card that listed the Texas conspiracy site, which describes the shooting as an exercise conducted by the Department of Homeland Security. Other people connected to the case, including hospital personnel, victims' relatives and possible trial witnesses, have received similar visits or seen their images on the Web site, officials said.