 It was known as the "Black Sabbath" in the Yishuv.Curfews were imposed throughout Palestine as British troops and police raided the Jewish Agency headquarters in Jerusalem, its offices in Tel Aviv, and other Zionist institutions, confiscating nine tons of documents.The British searched 27 Jewish settlements and discovered fifteen arms caches, including one of the Haganah's three central arsenals at kibbutz Yagur, which was a major blow to the Haganah's efforts to prepare militarily for independence.