At least 15 Britons were among 39 holidaymakers killed in the Tunisian beach massacre, but the toll may well rise.
Confirming the figure, Foreign Minister Tobias Ellwood added that the Sousse atrocity was "the most significant terrorist attack on the British people" since July 7, 2005, when 52 people were killed.
Kalashnikov-wielding student Seifeddine Rezgui targeted Western tourists as he terrorised the popular resort.
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One of those killed is reported to be 24-year-old fashion blogger Carly Lovett from Gainsborough, Lincolnshire.
Another British victim was named as Adrian Evans, who worked for Sandwell Council in the West Midlands as a manager in the gas services department.