Peter Bergen : Complicating the Syria picture is regionwide sectarian strife . He says the historic Sunni-Shia split is a key dynamic and U.S. strike could worsen conflict . Iraq 's death toll from sectarian struggles has been increasing . That is a real potential problem that needs to be weighed by Obama national security officials and representatives in Congress as they consider the options in Syria , because across the Muslim world from Lebanon to Pakistan , Sunnis and Shias are increasingly at each other 's throats . Bergen : The United States will likely be forced to take military action in Syria, but it may not have much choice, he said.
Peter Bergen : Complicating the Syria picture is regionwide sectarian strife . He says the historic Sunni-Shia split is a key dynamic and U.S. strike could worsen conflict . Iraq 's death toll from sectarian struggles has been increasing . Bergen : The United States will likely be forced to take military action in Syria, but it may not have much choice, he said.