More than a decade after concluding a fuel tank explosion destroyed TWA Flight 800, senior U.S. accident investigators stood their ground on Tuesday against skeptics claiming new evidence suggests missile fire downed the jumbo jet.
"I'm totally convinced there was no bomb or missile," National Transportation Safety Board investigator Jim Wildey told reporters at a briefing outside Washington.
Skeptics, including a former NTSB investigator, last month petitioned the agency to re-open its investigation and will release a documentary on the crash this month.
They said evidence suggests one or more missiles destroyed the Paris-bound Boeing 747 over the Atlantic shortly after takeoff from New York on July 17, 1996, killing all 230 on board.
The safety board has responded cautiously, saying it is having investigators who were not part of the original investigation review the petition. And it is seeking comment from Boeing, the Federal Aviation Administration, and other parties to the original probe.
But at the same time, the board allowed the original TWA 800 investigators to brief the media on the four-year investigation. Under orders to address only matters in the original investigation, the investigators nonetheless emphasized topics that have come under question by the critics.
They held up two sheet metal plates showing examples of bomb and high-velocity missile damage, and then took reporters to view TWA 800's reconstructed fuselage. They said they found no pitting of the type alleged by those challenging the findings.
"You don't see fragmented seat parts," said investigator Robert Swaim. Nor is there evidence of pitting, cratering or "gas jetting" -- tell-tale marks left by high explosives -- he said.
Investigators said they were unable to find any evidence on radar of a missile intercepting the plane.
And they discounted the significance of traces of explosives found on more than 100 airplane parts pulled from the ocean.
The NTSB said tests showed that explosive residue washes off after only two days in the ocean, leading them to conclude the residue likely was the result of contamination from the military and law enforcement boats that recovered wreckage.
The NTSB allowed two TWA 800 family members to attend the briefing, and the family members reiterated their support for the board's findings.
Matt Ziemkiewicz, whose sister Jill, a 23-year-old flight attendant, was killed in the explosion, said the briefing "solidified" his belief that the original investigation was "complete, accurate and thorough."
Jim Hurd, whose son Jamie, 29, died on the flight, also endorsed the NTSB finding.
"At first I was of course skeptical as everybody else. You know, you just didn't know what happened. As things unfolded, it seemed to make a lot of sense, what happened to the plane," he said. "It's really cut and dry, at this point, as far as I'm concerned."
Ziemkiewicz and Hurd said the new attention to the crash is opening old wounds.
"It's really a shame in my book," Hurd said. "There are still family members who believe it was brought down by a bomb and I respect their thoughts and however they want to view it. It's just the way you take the information and how you process it and who you believe. And I believe the NTSB has done a job and I don't believe they've covered up anything and I don't believe the FBI did either."
The NTSB did not allow their critics into the media briefing. They talked to reporters in a parking lot outside.
'A matter of conscience'
Hank Hughes, a former NTSB investigator who now doubts the board's conclusion, said he is motivated only by a desire to uncover the truth.
Hughes said following the accident, he spent two days with Hurd.
"That's the last guy in the world I'd want to hurt," he said.
"There's no profit motive. It's a matter of conscience and integrity as far as we're concerned. Two hundred and thirty people were killed and that's a tragedy that can't be ignored," Hughes said.
Hughes is featured in the documentary, called "TWA Flight 800," co-produced by longtime skeptic Tom Stalcup.