Comforting mourners on Tishah b'Av

Hi,

One may not comfort mourners on the night of Tisha b'Av or on Tisha b'Av morning, since one may not offer words of comfort, beyond the "HaMakom yinachem" formula. However, one who will not be able to visit from midday on Tisha b'Av until the end of shivah should visit the mourner earlier on Tisha b'Av; the visit will have value even without being able to offer words of comfort.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 5:20:22)

חג אורים שמח,
Mordechai