The piece of art, which consists of hundreds of photographs of Islanders blended to create a large image of Occupation survivor Barbara Jouanny on the side of Liberation Station, was damaged between 5pm on Thursday and 9am the following day when a picture was torn from the wall.
The mosaic was created as part of this year’s Liberation 75 celebrations.
Anyone with information is being asked to phone the States police on 612612 or Crimestoppers on 0800 555 111.
