23 January 1921
The HMS K5 submarine, which had first been launched in December 1916, sank en route to a mock battle in the Bay of Biscay, killing all 59 men aboard.
The house of Charles Coughlan, a Sinn Fein Alderman, was broken into in Cork and set ablaze.
Riots were reported in the Bihar and Orissa area of India, where there were serious outbreaks of looting at markets. The authorities said that the military were being despatched to the area to bring it back under control, with those involved thought to be linked to the non co-operation movement.