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Curtis' release comes just days after the execution of American journalist James Foley by the Sunni militant group ISIS.
Another American journalist, Steven Sotloff, is reportedly one of a handful of reporters still being held captive by the group.
The militant group has threatened to move forward with his execution if the U.S. does not stop airstrikes against ISIS outposts in Iraq. (Video via ABC)
Journalists as a whole haven't really found any sort of safe haven while covering the ongoing civil war in Syria.
A Committee to Protect Journalists report from late last year called the country the most dangerous place for journalists to cover.
The CPJ counts at least 70 journalists who have been killed while covering the civil war that has claimed the lives of more than 191,000 people.
In his statement, Kerry also said the U.S. will "continue to use every diplomatic, intelligence, and military tool" to bring any remaining U.S. captives back to America.
This video contains images from Getty Images.