Their line, which expanded this spring to include bomber jackets, light sweaters, sunglasses and jeans, is sold at high-end stores in 17 countries including Barneys in New York and Colette in Paris.

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The second was believed to be 6ft 3in, thin, with short brown hair with a left side parting and wearing a brown bomber style leather jacket, hooded sweatshirt and light blue jeans.

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He was wearing a grey bomber-style jacket with black lining and hood, light blue bleached jeans that were ripped at the bottom and grey hi-top trainers when he went missing.

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His followers included the so-called "shoe bomber" Richard Reid -- who was convicted of trying to light a bomb in his shoes on a trans-Atlantic flight -- and Zacarias Moussaoui, the only person to be charged in the United States in connection with the September 11, 2001, terror attacks.

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