Initial Sketch Of Diana Crash Site Reveals 2Nd Car -- `Probable Collision Zone' Shown In Drawing; Police Now Say They're Searching For Small Fiat

PARIS - Within hours of the accident that killed Princess Diana, French investigators believed a second car might have been involved in the crash, the first official sketch of the scene shows.

Tomorrow marks 100 days since the death of Princess Diana traumatized Britain and provoked a massive outpouring of national grief.

The diagram, obtained last week by The Associated Press, was made Aug. 31, the day the crash occurred along the Seine River.

The drawing offers a detailed look at the crash site and shows "a probable collision zone" between Diana's Mercedes and another car in the Pont de l'Alma traffic tunnel where the princess, her companion Dodi Fayed and their driver Henri Paul were killed.

Despite the sketch, investigators initially focused on the photographers tailing the princess, and then on the driver, who was legally drunk and on prescription drugs at the time of the high-speed accident.

It was not until almost three weeks later that police acknowledged they were looking for a small Fiat.

The search for the Fiat began after tests on pieces of taillight and traces of car paint found at the scene showed they didn't come from the Mercedes.

The diagram shows red glass was found at the scene of the "probable collision zone" between the two vehicles, which was marked by a 19-yard skid mark.

While the drawing shows other cars or motorcycles were traveling in the tunnel at the time, it does not indicate how investigators believe the small Fiat entered the tunnel - or got away.

The diagram also shows a second 32-yard skid mark, ending at the pillar where the Mercedes crashed.

The only survivor, bodyguard Trevor Rees-Jones, met twice with French investigators during the month he spent recuperating from his injuries at a Paris hospital.

During the second interview, on Oct. 2, Rees-Jones was shown three photographs of Fiat UNO cars, but said they "didn't bring anything to mind," judicial sources said.

Rees-Jones said Fayed assigned Paul, assistant security chief at the Ritz Hotel, to drive the Mercedes on the fatal night, said the sources, who spoke on condition of anonymity.

Nine photographers and a motorcycle courier are under formal investigation for manslaughter and failure to help people in danger. They haven't been charged, and the inquiry is still under way.