Online video purportedly shows ISIS militant beheading Japanese hostage Kenji Goto

Japanese officials said they are attempting to authenticate a video released on Saturday which shows the apparent beheading of Kenji Goto, a hostage of Islamic State militants, The Associated Press reports.

The video, titled "A Message to the Government of Japan," shows an apparent ISIS militant with a British accent, along with Goto, who kneels in an orange jumpsuit and does not speak in the minute-long video.

The militant speaks directly to Japanese Prime Minister Shinzo Abe, saying that Abe's "decision to take part in an unwinnable war," is to blame for Goto's beheading.

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"Let the nightmare for Japan begin," he adds.

Japanese and Jordanian officials had been attempting to negotiate through indirect channels for the release of Goto and Jordanian pilot Muath al-Kasaesbeh.