Officials say Obama 's historic inauguration poses high security risk . FBI has been especially aggressive in examining white supremacy groups . A major unknown is how large the crowd will be for Tuesday 's activities . Federal officials acknowledge the inauguration of the first African-American U.S. president could be an attractive target . Comment:
Officials say Obama 's historic inauguration poses high security risk . FBI has been especially aggressive in examining white supremacy groups . A major unknown is how large the crowd will be for Tuesday 's activities . Comment: