Fire at Flight 93 National Memorial in Pa. may have damaged 9/11 memorabilia

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5. They don't yet seem to know how this started, but terribly sad, especially for the families

Ken Nacke, whose brother Louis was on Flight 93, said many 9/11 artifacts -- including notes and other mementos left at a temporary memorial at the crash site -- were being stored in the area where the fire burned.

He said he had spoken Friday with the head of Families of Flight 93 shortly after the group president was contacted by the memorial's superintendent.

"I think stuff has been lost," Nacke said. "I just don't know what has been lost. I know the layout of the buildings and I wouldn't be surprised. It's heartbreaking that we spent all this time to have this happen. All the blood sweat and tears that went into building this."

Nacke helped raise funds for the Flight 93 National Memorial and advised in its planning.

"At the temporary memorial, people would leave cards, T-shirts and handmade stuff that was very comforting to us," he said. "That's why it's heartbreaking. I hope none of this stuff is lost."