https://scd.france24.com/en/files/imagecache/home_1024/images/afp/0c5c6e0030863cb6b0248c815b1d44b83fabe64f.jpg france24.com foreign hostages executed under the is 'caliphate' 2019-03-23 A self-employed security contractor from Japan, he was seized in Syria in August 2014. . ..…