The broken window and the other windows in the church are not made from stained glass, because Le Corbusier considered stained glass to be too similar to the old ways of architecture. Instead, he hand-painted the glass with his own personal lexicon of symbols and words. The destroyed window contained a sun-like image surrounded by crude clouds.
It also appears that the vandals attempted to gain entry through a door but failed, possibly prompting them to break the window to gain access. Because the window was hand-painted, it is impossible to replace. Upon assessment, the windows was deemed to be priceless and irreparable. The Fondation Le Corbusier has called for immediate measures to protect the site from further damage, and it also took the opportunity to point out the existing structural problems within the church, like moisture issues and failing masonry, hoping to call attention to building’s preservation needs. You can view a video of the damage here.