Officers investigating on behalf of Coroner of Inquests
Police are appealing for video footage, or photographs, of the sidecar which was involved in a fatal incident at Ago's Leap on Saturday.
Officers are asking for help from accredited media, who were on the course, who captured what happened to sidecar 21 and the lead up to it.
It's part of an ongoing investigation into the death of sidecar racer César Chanal.
The Frenchman died at the scene on the first lap of the rescheduled first Sidecar race on 4 June.
His teammate Oliver Lavorel – who TT organisers initially wrongly confirmed had died – remains in a critical condition at Aintree University Hospital in the UK.
Police are investigating the incident on behalf of the Coroner of Inquests.
The sidecar was running with number 21 signage on the day after the outfit was moved up the grid.