A 21 year old motorcyclist remains in hospital with serious injuries following a collision with a lorry near the Last Post pub.
The crash - between a HGV tipper truck and a white Suzuki GSXR motorcycle - happened just after 4pm on Monday (30 May) at the junction of Rue Frairies and Rue des Buttes in St Andrews.
The rider is in a stable condition in Guernsey's Princess Elizabeth Hospital.
Investigators want to speak to anyone who witnessed the crash or who can help with the route the motorcyclist was taking before it happened.
"If you have any information regarding this incident you are asked to contact PC 174 POTTER on the Roads Policing Unit on 222 222 or to contact Crimestoppers anonymously on 0800 555 111."
All emergency services attended the scene and the road was closed for several hours.

Number portability issue between Coop Mobile and JT resolved
Guernsey's emergency sleeping pods 'in demand'
Alderney one-step closer to getting a swimming pool
Tickets on sale for women's Muratti
Move to get a full size inflatable pool for Alderney
Three Guernsey seal pups released in spring sunshine
Work begins to clear fallen trees from Guernsey's Reservoir Walk
Guernsey Police to target drivers who put others in danger