1921 Palestine riots

Mass grave of Jewish victims of the 1921 riots, Trumpeldor cemetery, Tel Aviv
Date	1-7 May 1921
Location	Jaffa, Mandatory Palestine
Caused by	Dispute between Jewish groups mistakenly reported as an attack on Arabs
Parties to the civil conflict
Jewish civilians Arab rioters
Casualties
47 deaths, 146 injured 48 deaths, 73 injured
Most of the Arab casualties were caused by British forces

The Jaffa riots (commonly known in Hebrew: מאורעות תרפ"א‎, translit. Me'oraot Tarpa‎) was a series of violent riots in Mandatory Palestine on May 1–7, 1921, which began as a fight between two Jewish groups but developed into an attack by Arabs on Jews during which many were killed. The rioting began in Jaffa and spread to other parts of the country. The riot resulted in the deaths of 47 Jews and 48 Arabs. 146 Jews and 73 Arabs were wounded.

On the night of 1 May 1921, the Jewish Communist Party (precursor of the Palestine Communist Party) distributed Arabic and Yiddish fliers calling for the toppling of British rule and the establishing a "Soviet Palestine". The party announced its intention to parade from Jaffa to neighbouring Tel Aviv to commemorate May Day. On the morning of the parade, despite a warning to the 60 members present from one of Jaffa's most senior police officers, Toufiq Bey al-Said, who visited the party's headquarters, the march headed from Jaffa to Tel Aviv through the mixed Jewish-Arab border neighbourhood of Manshiyya.

Another large May Day parade had also been organized for Tel Aviv by the rival socialist Ahdut HaAvoda group, with official authorization. When the two processions met, a fistfight erupted.Police attempted to disperse the about 50 communist protestors, and Muslims and Christians intervened to help the police against the Jews. A general disturbance quickly ensued and spread to the southern part of town.