Five minutes later, a sheriff's tactical unit fired gas canisters into the cabin after Dorner refused to respond to commands to surrender, logs showed.

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And the information systems and technology unit is a leading supplier of tactical communications and cyber-security solutions.

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Now a tactical advisor to the Metropolitan Police's SO19 firearms unit, Mr Cahill said the MBE was "quite a surprise".

BBC: NEWS | UK | England | London | Modernising gay officer gets MBE