Authorities investigating the death of Princess Diana staged road tests using the same kind of Mercedes she crashed in and motorcycles like the ones photographers used to pursue her, a police spokesman said Thursday.

The acceleration tests, which took place Wednesday on a race track outside Paris, were aimed at corroborating witness and photographers' accounts of the accident, the spokesman said on condition of anonymity.A Mercedes 280S and about 10 motorcycles and scooters were used at the track in Montlhery, about 25 miles south of the capital.

Watching the tests were investigating Judge Herve Stephan, a private expert he hired and an official from the criminal research center holding the wrecked Mercedes.

A police source said earlier the tests could take place over two days. But rain fell in the Paris area Thursday, and sources at the track said no tests were planned. There was no word on further tests.

A technical report is expected in October.

The tests came ahead of a closed-door hearing June 5 in which Stephan will try to clarify the role of the nine photographers and a press motorcyclist in the crash that killed Diana, her boyfriend Dodi Fayed and driver Henri Paul.

The hearing is to include the suspects, 10 eyewitnesses and Mo-hamed Al Fayed, Dodi's father who has filed as a civil party in the case and blames photographers for the crash.

Investigators have focused on several factors, including the high rate of speed of the Mercedes and that Paul was legally drunk as he tried to evade photographers.