I saw a few videos. The western wall is הכותל המערבי, literally translates to the western wall, usually called the Kotel. It’s the closest place to the Temple Mount that we can (legally) pray today. I believe it was originally a section of the courtyard wall around the Temple Mount.
https://x.com/israel/status/1823460060229722523?s=46
this is the close of the fast. They are singing אחינו.
אַחֵינוּ כָּל בֵּית יִשְׂרָאֵל, הַנְּתוּנִים בְּצָרָה וּבַשִּׁבְיָה, הָעוֹמְדִים בֵּין בַּיָּם וּבֵין בַּיַּבָּשָׁה, הַמָּקוֹם יְרַחֵם עֲלֵיהֶם, וְיוֹצִיאֵם מִצָּרָה לִרְוָחָה, וּמֵאֲפֵלָה לְאוֹרָה, וּמִשִּׁעְבּוּד לִגְאֻלָּה, הַשְׁתָּא בַּעֲגָלָא וּבִזְמַן קָרִיב.
our brothers, the house of Israel, who are in trouble or captivity, whether they are standing (abiding) in the sea or on dry land, Hashem should have mercy on them, and bring them out from trouble to comfort, from darkness to light, from captivity to redemption, now, quickly, in a near time.