I contacted my host family today.  I am glad they are safe.  This is what my host mother wrote to me:

Chère Arielle,
Merci beaucoup de ton message.
Aucun de nous n’a été touché et tout le monde est en vie, personne n’est blessé mais beaucoup de jeunes ont trouvé la mort dans cette tragédie et Paris est en deuil.

Translation:

Dear Arielle,
Thank you for your message.  None of us were touched every one is alive.  No one is hurt (meaning no one in their family) many people have died in this tragedy and Paris is in mourning.