Residents in the al Shabaab-controlled towns of Kismayu and Baidoa say foreign fighters -- east Africans, Arabs and Asians -- have arrived in recent weeks and now sport the popular green suit and black mask of al Shabaab. (Additional reporting by George Obulutsa in Zanzibar; Noor Ali in Garissa; Writing by Andrew Cawthorne; Editing by Daniel Wallis and Mark Trevelyan)
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