Obama says beheading videos won't intimidate US

President Barack Obama pauses as he speak in Edgartown, Mass., Aug. 20, about the killing of American journalist James Foley by militants with the Islamic State extremist group. The president said the US will continue to confront Islamic State extremists despite the brutal murder of journalist James Foley.

TALLINN, Estonia— President Barack Obama said Wednesday that the United States will not be intimidated by Islamic State militants after the beheading of a second American journalist and will build a coalition to "degrade and destroy" the group.

Obama still did not give a timeline for deciding on a strategy to go after the extremist group's operations in Syria. "It's going to take time for us to be able to roll them back," the president said at a news conference during a visit to Europe.