Scientists still working to make September 11th DNA matches 24 years later

NEW YORK (WABC) -- "The rumbling, it was the loudest, most violent time of my life," said Mark Desire.

On the morning of September 11th, Desire rushed down the World Trade Center just after the first plane struck the north tower.

"That was a defining moment for me," said Desire.

It was his job to collect evidence for the New York City Medical Examiner's office.

"That morning it was all hands-on deck and our job was to preserve the evidence so that means the victims, potential weapons and pieces of the plane," he said.

He was standing close to the south tower when it collapsed.

"I was running and thinking I'm going to make it through the door and then I got hit and I went through the window," he said.

Desire jumped partially inside a nearby building; the debris crushed his foot.

"I