A forensic chemist deploys as part of the team, so we should know something soon about the explosive residue.

He looked at me intensely and went on, "First, there was absolutely no chemical evidence found of explosive residue other than fuel-air.

If explosive residue is found, the doors of the machine are locked and the passenger cannot get out until released by an officer.

And the new findings of explosive residue came from nearby.

First, there was no explosive residue found on any of the salvaged wreckage.

So, you want me to come to a conclusion about the total lack of explosive residue and missile parts?

"It explains why no one has found explosive residue or missile parts."

I repeated dutifully, "There was absolutely no chemical evidence found of explosive residue other than fuel-air."

All of them were detained by American military patrols, who allowed the women and children to continue but tested the men for explosive residue.

Another Federal official said yesterday that bomb experts had several reasons to be cautious about the positive finding of explosive residue.