During the reburial of the bodies from the Gush Katif cemetary, Rabbi Yigal Kaminetzky mentioned that when he was expelled from his home he made a tear his shirt as a sign of mourning. He added that when the IDF turns over the settlements to the Arabs, everybody would be required to do so. In Hebrew this is called keri'ah.
I had forgotten Rabbi Kaminetzky's words about keri'ah until last night. Someone in my daf yomi class mentioned that Rabbi Mordechai Eliyahu also required this.
So last night I tore the shirt that I was wearing in accordance with Jewish Law.
May all those who mourn the destruction of Jewish communitees in the land of Israel merit to rejoice in their rebuilding, as it is written with regards to Jerusalem: “Rejoice ye with Jerusalem, and be glad with her, all ye that love her; rejoice for joy with her, all ye that mourn for her.” (Isaiah 66:10) “All who mourn for Jerusalem will merit to see its great joy." (Ta'anit 30B)