In the evening after the attempted 21 July 2005 London bombings, Specialist Firearms Officers supporting the search for the bombers were issued with hollow point ammunition. When police linked Hussain Osman and another suspect to a block of flats in Brixton, the block was placed under surveillance. Commander Cressida Dick, who would also act as Gold Commander of the operation, was appointed as Kratos DSO. The firearms team were informed that they faced suicide bombers, that a DSO was in place, and that they might be required to use "unusual tactics".