Three members of a Dutch motorcycle gang have reportedly gone to Iraq to join the fight against Islamic State extremists.

Three No Surrender bikers are reportedly near Mosul.

The head of the "No Surrender" gang Klaas Otto told Dutch media that the trio left for northern Iraq after being horrified by the pictures of the ISIS beheadings.

Mr Otto says the bikers are all trained soldiers who have served in the past.

"They are trained guys with lots of experience - with foreign missions, too," Mr Otto told Dutch broadcaster Omroep Brabant.

"They are extremely disciplined. They don't drink any alcohol, not even on club evenings."

The biker's departure was highlighted on social media, when a photo appearing to show a man dressed in green military fatigues, holding a Kalashnikov, sitting with a Kurdish fighter.

Dutch prosecutors told the BBC that they were not necessarily breaking the law by fighting on the Kurdish side.