That month, Stalin travelled to the port city of Batumi. His militant rhetoric proved divisive among the city's Marxists, some of whom suspected that he might be an "agent provocateur" working for the government. He found employment at the Rothschild refinery storehouse, where he co-organised two workers' strikes. 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 another 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 he was sentenced to three years of exile in eastern Siberia.