One of the men is made to make a full confession, explaining his 'crimes' to the camera, before they pair are beheaded and their bodies shown to the camera.

The gruesome execution video echoes those posted by Islamic State and is the second released by Boko Haram.

Mr Muhammad tells the camera that he is a farmer from Baga, northern Nigeria, and is then made to answer a series of questions at knifepoint.

Mr Muhammad reveals that hat he had been approached by a police officer who offered him money in exchange for infiltrating Boko Haram.

'We went to see a man from Mijka and a police officer that was with him. The officer gave me 5,000 Naira (£16.20),' Mr Muhammad tells the camera.

Mr Muhammad is made to confess that their mission has been to spy on the 'residents who live here' i.e. Boko Haram, and in exchange for spying, the police officers had promised him that he would 'become rich and will never go back to be a farmer again'.

(dailymail.co.uk)