 The revolutionaries decided not only to murder him, but also to strike a terror in the British official circles by launching an attack on the Secretariat Building - the Writers' Building in the Dalhousie square in Kolkata.On 8 December 1930, Badal along with Dinesh Gupta and Benoy, dressed in European costume, entered the Writers' Building and shot dead Simpson.Police in the building started firing at them in response.