Celebrity Instagram accounts targeted

Milan's 'acrobat thieves' use Instagram tags 'to rob rich and famous'

The group examined celebrities' photos to find entry points, using tagged locations to find out where they lived and when they would be out.

Footage released by officials shows the robbers scaling apartment buildings.

Among the victims were TV host Diletta Leotta and footballer Achraf Hakimi.

One suspect was arrested in January, and three others on Wednesday. They include a 17-year-old who will appear in Juvenile Court.