What is the terrorist group most likely to strike within the United States in the next five years? What method or means will this group probably use to carry out the attack and what is the most effective means of countering the attack?

Near-Term Future of Terrorism in the United States

What is the terrorist group most likely to strike within the United States in the next five years?

What method or means will this group probably use to carry out the attack and what is the most effective means of countering the attack?