Bombing Motive Sought for Brothers Who Differed in Style

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As investigators searched for a motive in the Boston Marathon bombings, the two brothers suspected in the attack emerged as markedly different personalities: the older moving closer toward Islamic fundamentalism, the younger socializing like a typical American college student.

Tamerlan Tsarnaev, 26, disrupted a service with an outburst during a sermon at the Islamic Society of Boston in January, raising concerns among the congregation, Anwar Kazmi, a member of the group’s board of trustees, said in an interview yesterday. Tsarnaev objected to the idea that both Martin Luther King Jr. and the Prophet Muhammad could be mentioned in the same context as sources of inspiration, Kazmi said.