A spy who worked for a country in the U.S.-led coalition that is fighting Islamic State had helped three British girls to cross into Syria to join the militants and has been caught, the Turkish foreign minister said on Thursday.

The minister, Mevlut Cavusoglu, told broadcaster A Haber in an interview: "He was caught. It turned out to be someone who works for the intelligence of a country from the coalition."

He didn't say which country the spy was working for, but said it was not the European Union or the United States. The coalition also includes countries such as Saudi Arabia, Qatar, Jordan, Bahrain, Australia and Canada.