Federal officials would not say why the inquiry took so long.

Either way, experts said, the inquiry could take at least six months.

The inquiry could take six months or more, he said.

Testing ended so further inquiries could take place, according to the Times.

There were no arrests in the case, however, and officials said the inquiry might take weeks or months.

"I just wanted to make sure the inquiry took place."

He added that the inquiry had taken a deep personal toll.

That inquiry could take two to six weeks or longer, a senior Army officer said.

This inquiry took several years, and the assessment was based on a complete set of data.

It is not known how long the inquiry will take.