 After several strike leaders were arrested, he co-organised a mass public demonstration which led to the storming of the prison; troops fired upon the demonstrators, 13 of whom were killed.Stalin organised a second mass demonstration on the day of their funeral, before being arrested in April 1902.Held first in Batumi Prison, and then Kutaisi Prison, in mid-1903 Stalin was sentenced to three years of exile in eastern Siberia.