An independent investigating commission showed to reporters a four-second video made by NASA of Columbia's January 16 takeoff during which debris is seen striking shuttle's left wing near its landing wheel well.

Columbia burned up on reentry into the earth's atmosphere on February 1 after superheated gasses entered a breach in the orbiter's skin in the area struck by the foam.

The shuttle was just 16 minutes from landing when it disintegrated over Texas, killing all seven astronauts on board.

NASA officials at first discounted the frozen foam insulation as a cause leading to the disaster.

Investigators are now looking into whether the front of the wing, which faces extremely high temperatures on reentry, might have been damaged, causing a rupture in the vessel's protective outer layer that led to its burning up on reentry.

In the video, "a piece of foam comes down impacting the leading edge," said Sheila Widnall, a member of the investigating panel.

Admiral Harold Gehman, who is leading the probe, said that other photographs indicate more debris.

"From other camera angles, most photo analysts think they were three pieces of debris -- whether or not two are foam and one is ice, or all have ice and foam, we don't know," he said.

To date, a total of 28,286 pieces of the shuttle have been collected and are being assembled in a hanger at the Kennedy Space Center in Cape Canaveral, Florida. Of those, 25,404 have been identified, Gehman said.

However just laying the debris on the floor "is not enough," Gehman said. "Heat testing is necessary."

Meanwhile a NASA engineer whose e-mail messages seemed to predict failures leading to the loss of the shuttle said he only meant to speculate about worse-case scenarios.

"I wanted to make sure that everybody could be as ready as possible for any eventuality," engineer Robert Daugherty told reporters.

"The e-mail was intended to spark discussion to ensure there were such plans and I believe they did just that."

NASA engineers worried about possible damage from the falling insulating foam, but space agency officials dismissed the concerns, stating there was no need for a space walk to assess any damage which they suggested could have caused further harm.

E-mail messages show mission specialists were nevertheless concerned throughout the orbiter's mission. Only recently did NASA release the exchange of messages, causing chagrin among NASA's friends and foes alike.

"Honestly, I was very surprised by the attention my writing received," Daugherty said during the telephone press conference.

Daugherty wrote to a NASA official: "You should seriously consider the possibility of the (landing) gear not deploying at all if there is a substantial breach of the wheel well."

At some point the wheel "could fail and send debris everywhere," he wrote, adding that sending out astronauts to look at the damage "has more pros than cons."

"Can't imagine that an astronaut would cause MORE damage than he is going out to look for," he wrote.

Astronauts may have tried to take control of Columbia
The Columbia crew may have tried to override the space shuttle's autopilot to take control as the craft re-entered the Earth's atmosphere and broke up, two newspapers reported.

Both reports suggest new data, which pertain to the final moments before the Columbia disaster on February 1, contradict previous statements that the craft was operating normally until communication with the crew was lost.

The shuttle may have already been spinning out of control with its left wing either damaged or destroyed during the final two seconds of communication between the crew and mission control, according to sources close to the inquiry quoted in the New York Times.

The data suggest the shuttle's nose was turning at a rate of at least 20 degrees per second, the maximum the craft's instrumentation could record. That would mean the vessel was rotating at a rate of almost four times per minute.

One crew member may have tried to suspend the autopilot, according to USA Today which focused on the analysis of 32 seconds of broken communication.

The new information indicates that although the autopilot was temporarily overridden, the spacecraft was never flown manually, suggesting that a crew member may have accidentally switched it off and then rectified the mistake.

However, the data, which is due to be made public this week, is so fragmented that it may be prone to misinterpretation, the source said.

All rights reserved. � 2003 Agence France-Presse. Sections of the information displayed on this page (dispatches, photographs, logos) are protected by intellectual property rights owned by Agence France-Presse. As a consequence, you may not copy, reproduce, modify, transmit, publish, display or in any way commercially exploit any of the content of this section without the prior written consent of Agence France-Presse.

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