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A sick selfie showing the man accused of decapitating his boss in France posing with the victim's body has emerged online.

ISIS supporter Yassin Salhi who later allegedly spiked the head of Herve Cornara on the gates of a gas factory near Grenoble, is reported to have posed for the twisted photo before he was arrested.

It is alleged that Salhi, 35, sent the picture via WhatsApp to a fighter in war-torn Syria.

On the same day, he was detained near Lyon after allegedly causing an explosion by ramming his vehicle into an area containing flammable liquids.

Mr Cornar's decapitated head was found pinned to front of ATC-Colicom in Chassieu. An official said two flags - one white and one black, both with Arabic inscriptions - were found nearby.

(Image: Getty)

Later, anti-terror police searched the apartment of Salhi, a father-of-three, in the Moines neighbourhood of the town.

They took his wife and sister into custody. Another man was arrested but released without charge.

Yassin Salhi had been investigated in the past about his alleged links with Islamist militants.

Salhi does not have a criminal record, but he was listed between 2006 and 2008 as someone at risk of radicalisation, and later came to the attention of intelligence services because of his links to radical Islamists,

Speaking after the attack, French president Francois Hollande said: "We have no doubt that the attack was to blow up the building. It bears the hallmarks of a terrorist attack."