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