The Nainital wedding massacre occurs, killing 22 members of the Harijan caste.

List of mass stabbing incidents (before 2010)

This is a list of mass stabbings that took place before 2010. It includes incidents in which there were at least three casualties.

April 21

Day of the year

April 21 is the 111th day of the year in the Gregorian calendar; 254 days remain until the end of the year.