On 1 February 1944, the Irgun proclaimed a revolt. Twelve days later, it put its plan into action when Irgun teams bombed the empty offices of the British Mandate's Immigration Department in Jerusalem, Tel Aviv, and Haifa. The Irgun next bombed the Income Tax Offices in those three cities, followed by a series of attacks on police stations in which two Irgun fighters and six policemen were killed. Meanwhile, Lehi joined the revolt with a series of shooting attacks on policemen.