l’allarme bomba (m.)
Today’s #PdG is the masculine noun l’allarme bomba, which means bomb scare.
The web site for the newspaper La Repubblica in Rome was briefly shutdown due to a bomb scare. You can read about the bomb scare on their web site. A screen capture below can be seen of their web site where they reported the scare, which briefly halted updates to their site.
If you want to hear the noun pronounced, you can hear a good pronunciation here:
A bomb scare is when someone calls a company/business/person and says that there is a bomb inside the building/residence/etc.