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At high school in Togo, Brako recalls that AbdulMutallab usually wore jeans and a T-shirt.
CNN: STORY HIGHLIGHTS
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"In London he isolated himself from some of his former friends, " Kwesi Brako told CNN.
CNN: STORY HIGHLIGHTS
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Brako kept up with AbdulMutallab through mutual friends in the British capital.
CNN: STORY HIGHLIGHTS
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Brako, a Christian, was in the same year as AbdulMutallab at the English boarding school they attended in the western African nation of Togo and said they were close friends.
CNN: STORY HIGHLIGHTS
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"He was very humble, " Brako recalled.
CNN: STORY HIGHLIGHTS