While the Louvre was closed on Tuesday, the museum continued beefing up its security, this time by installing bars on the window through which thieves entered the institution in October and stole bejeweled objects, most of which still have not yet been recovered.

The window faces into a space in the Galerie d’Apollon. The thieves reached the window from the outside using a ladder, then applied power tools to slice through the glass and come into the gallery.

After being denounced by politicians and the public alike, the museum promised to improve its security. Francis Steinbock, the Louvre’s deputy administrator, told the Agence France-Presse today that the bars marked one attempt to do just that.

“We had committed to doing it before the end of the year,” Steinbock said. He noted that the museum had plans to continue discussing “securing other windows.” Other planned security measures involve the installation of 100 security cameras.