"We are outraged and horrified that this heinous attack is believed to have been carried out by Israeli Jewish extremists, who sought out and brutally murdered an innocent Palestinian teen," ADL Director Abe Foxman said in a statement released Sunday following new developments in the murder case of Muhammad Abu Khdeir. 

"Israeli authorities must fully investigate this crime and prosecute those responsible for this murder to the fullest extent of the law."

Foxman added that "vigilantism and revenge killings will not be tolerated in Israeli society and are anathema to Jewish values."

The ADL extended its "deepest condolences" to the family of Abu Khdeir.

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