US Secretary of State John Kerry said on Tuesday his country is starting an operation with Turkey to finish securing the northern Syrian border.

US Secretary of State John Kerry said on Tuesday his country is starting an operation with Turkey to finish securing the northern Syrian border.

"The entire border of northern Syria - 75 percent of it has now been shut off. And we are entering an operation with the Turks to shut off the other remaining 98 kilometers," he said in an interview with CNN.