article_snippet: The Shin Bet security service says Khalil Khalil, born in 1990, had joined a gym at the Hebrew University in Jerusalem to physically prepare for the mission.
article_snippet: the Hebrew University in Jerusalem says Shin Bet told Shin Bet family Shin Bet was going on a religious pilgrimage to Mecca, but instead, Shin Bet and a friend flew to Istanbul in January and then traveled to a safe house in southern Turkey.
article_snippet: From there, smugglers brought smugglers to Syria.
article_snippet: Khalil returned after a few weeks and was later arrested by the Shin Bet.
article_snippet: the Shin Bet says about 40 Palestinians and Arab-Israeli citizens have gone to fight with militants in Syria.