But other experts believe it is too soon to talk about threats to the U.S. homeland. Daniel Benjamin formerly served as the State Departments anti-terrorism coordinator during the presidency of Bill Clinton.

　　At this point, this group is overwhelmingly an insurgent group focused on holding territory in Iraq, in killing Shia and in stoking the sectarian conflict in that region.

　　Daniel Benjamin says the Islamic State has no experience with what he calls out-of-the-area attacks. He adds that such attacks are much more difficult to carry out than most people realize.

　　It takes a great deal of training and practice and expertise. It takes people who understand how to deal with masking their identities, with exercising a great deal of communications security and other aspects of operational security.

　　He also says the United States has time to develop a long-term plan for containing and limiting the ability of Islamic State fighters.

　　The U.S. military has helped Iraqi and Kurdish forces regain territory captured by the fighters. The military also has increased airstrikes against the IS forces in Iraq.

　　For days, U.S. officials have talked about expanding the airstrikes to Syria. It appears, however, that such action may be delayed. On Thursday, President Barack Obama told reporters that he is still developing a plan to deal with the militants.

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