Story highlights Mother says her son wanted a world without war

Video has not been authenticated by CNN

Japan leader says nation will never forgive ISIS

(CNN) A newly distributed ISIS release appears to show the decapitated body of captive Japanese journalist Kenji Goto, after an English-language lecture is given by masked ISIS member "Jihadi John" to the people of Japan.

The video, 67 seconds long, was released Saturday as others before it, by ISIS media wing Al Furqan Media, and cannot be authenticated by CNN.

"We are deeply saddened by this despicable and horrendous act of terrorism and we denounce it in the strongest terms," Japanese Prime Minister Shinzo Abe said in Tokyo, according to broadcaster NHK. "To the terrorists, we will never, never forgive them for this act."

Kenji Goto in Aleppo, Syria, on October 24, 2014.

He said that Japan will continue to provide humanitarian aid to countries affected by the bloody fight against ISIS.

Goto's mother, Junko Ishido, said he wanted to help create a world without wars.

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