Two teens have been arrested in connection with thefts from cars parked in Minden Place multi-storey.
It happened in the early hours of Tuesday morning (8 November).
Two teenage boys, aged 14 and 15, have been arrested by police on suspicion of various motoring offences.
Officers are now urging people who had their car parked there to check to make sure nothing is missing.
The boys have been released on bail.
Anyone with information is being asked to contact the States of Jersey Police on 612612 or Crimestoppers anonymously on 0800 555111

'Momentous' week in Jersey's States
Plans to charge wealthiest patients for medical travel
Railway Walk reopens 'several weeks' ahead of schedule
New bar opening at former Rojo and X site to evolve Jersey's nightlife
Former Chief Minister seeks re-election
Château Vermont to become home to new music campus
St Saviour break and entry suspect pictured posing on motorbike
'Overstretched' neurology department following under-experienced managers