London - Two laptops have been stolen from offices used by a former police chief who is heading a probe into the death of Princess Diana in a Paris car crash in 1997, a newspaper said on Tuesday.

The theft sparked fears that the equipment may contain material from Operation Paget, the investigation headed by former Metropolitan Police Commissioner Lord John Stevens, the Daily Express said.

However, a spokesperson for the Metropolitan said the computers did not contain any sensitive information or any material linked to the probe.

Lord Stevens, a former chief constable of Northumbria Police, has an office in Gosforth on the outskirts of Newcastle upon Tyne. Detectives with Northumbria Police are investigating two burglaries there in the past 10 days, the newspaper said.

The first took place on the weekend of January 28 to 29 when the computers and cash were taken. The second took place last weekend, when nothing was taken.

Northumbria Police also said there was no evidence that the break-ins were linked to Lord Stevens' work.

Stevens has been investigating speculation that the princess of Wales' death was not the result of a straightforward car accident.

The probe was ordered in 2004 by the royal coroner, Michael Burgess, amid continuing conspiracy theories.

Diana married Prince Charles, the heir to the throne, in 1981 and the pair separated 11 years later.

Diana, 36, her lover Dodi Fayed and their chauffeur Henri Paul were killed when they crashed in a Paris tunnel on August 31, 1997.

A two-year French investigation blamed Paul for losing control of the car because he was high on drink and prescription drugs and driving too fast. - Sapa-AFP