President Barack Obama says the United States will not be intimidated by the beheading of a second American journalist, and vowed to build a coalition to "degrade and destroy" the Islamic State extremist group. Speaking to reporters Wednesday in Estonia, Obama said it will take time to "roll them back," or apply pressure to the group claiming responsibility for the murders of Steven Sotloff and James Foley. The video of Sotloff's beheading was released Tuesday and his identity was verified by U.S. officials within hours. Obama said the killers have failed in whatever they are trying to achieve because the United States and the world are "repulsed by their barbarism" and will not be intimidated. Read more http://www.voanews.com/content/islamic-state-beheading-steven-sotloff/2436851.html