The Jaffa riots commence.

The Jaffa riots were a series of violent riots in Mandatory Palestine on May 1–7, 1921, which began as a confrontation between two Jewish groups but developed into an attack by Arabs on Jews and then reprisal attacks by Jews on Arabs. 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, with 146 Jews and 73 Arabs wounded.

May 1 is the 121st day of the year in the Gregorian calendar; 244 days remain until the end of the year.