Killed and buried in a shallow grave. One of the 16 year old boys was also a US citizen.

http://www.foxnews.com/world/2014/06/30/bodies-israeli-kidnapped-teens-found-government-confirms/

Quote
Israel's nearly three-week vigil for three teens kidnapped in the West Bank � including one with U.S. citizenship � ended grimly Monday, with the discovery of their bodies just north of Hebron.

The search for Eyal Yifrach, 19; Gilad Shaar, 16; and Naftali Frenkel, also 16, who were snatched while hitchhiking, ended even as Israeli forces were conducting raids in the West Bank, where Hamas operates. Frenkel holds dual U.S.-Israeli citizenship.

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