Story highlights A video posted by Boko Haram shows the apparent beheading of two men

The video is similar in style and content to beheading videos posted by ISIS

"It's clear Boko Haram is leaning toward ISIS," says an expert who monitors Boko Haram

Kano, Nigeria (CNN) Boko Haram, the Islamist extremist group already blamed for numerous horrific attacks in West Africa, posted a graphic video online Monday showing the apparent beheadings of two men who the group said were suspected spies.

The six-minute video shows two men with their arms tied to their backs. They are made to face the camera on their knees, with another man towering over one of them brandishing a knife.

The knife-wielding man reaches toward the throat of one of the kneeling men, then the video switches scenes to show what appear to be the bloody severed heads of the two men placed on their headless bodies.

The SITE Intelligence group, which monitors extremist activities, released a translated transcript from the video, including what SITE called an "interrogation" of one of the two men. The man identifies himself as a farmer from the Nigerian town of Baga. He says he was told by a policeman that if he provided information about "the residents who live in here ... I will become rich and never go back to be a farmer again."

A still image from a Boko Haram video appears to show the run up to the beheading of two men accused of spying.

The apparent beheadings then follow on the video. SITE said the video, which included Arabic, English and French subtitles, was posted online via Twitter and "borrows certain elements from productions" of beheadings by ISIS.

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