Three Canadians who are said to have joined Jabhat al-Nursra were "directly involved in the holding and harsh interrogation" of Peter Theo Curtis and Matthew Schrier, according to a media report.

American journalist Peter Theo Curtis has returned home to the United States, two days after being freed by a Syrian extremist group.

An American journalist kidnapped and held hostage for about two years by an al-Qaida-linked group in Syria was released Sunday.