In May 1921, riots broke out in Jaffa, particularly around the Red House whose inhabitants were massacred. The riots were initially triggered by a May Day clash between the Mopsim and Ahdut HaAvoda, but quickly led to clashes between Jews and Arabs. 95 people were killed and 219 injured. As a consequence of the events, thousands of Jewish residents fled from Jaffa to Tel Aviv. A climate of mutual suspicious and hatred arose and grew.