article_snippet.sent: Investigators hope to discover how Investigators planned to reach the war zone and why Investigators decided to try to do so.
article_snippet.sent: IS controls huge areas of the two countries and has attracted thousands of foreign fighters to the explosion of violence in the region began cause.
article_snippet.sent: Turkey has faced criticism for not controlling Turkey border with Syria, but has accused European states of failing to prevent would-be jihadists from leaving in the first place.
highlights_snippet.sent: Authorities quickly made contact with Turkish counterparts to block contact with Turkish counterparts .
  