Kurdish militiamen defending outposts against Islamic State's lethal advance in northern Iraq have found reinforcement force from the most unlikely source-a motorcycle gang from the Netherlands.

Three members of the biker gang called Dutch No Surrender joined the ranks of the Kurdish militia forces in Mosul, according to a report by the Dutch broadcaster NOS.

Like Us on Facebook

Klaas Otto, the gang's head, confirmed that the three men came from Rotterdam, Amsterdam and Breda and have traveled to northern Iraq to engage in the war against the notorious Islamic State group.

A photo uploaded on Twitter last week featured a tattooed Dutchman, identified as "Ron", clad in military garb and clutching a Kalashkinov assault rifle. The man flashed a victory sign as he sat with a Kurdish comrade in a bunker.

"Ron from The Netherlands has joined the Kurds to exterminate the rodents of [ISIS]," read the caption.

Commenting on the legality of the move, Dutch public prosecutor Wim de Bruin told AFP that Dutch citizens are allowed to join foreign armed forces.

So long as citizens do not enlist in crimes against Netherlands or join terrorist groups like the Islamic State or the Kurdistan Workers' Party, they are not committing any criminal offense, de Bruin said. He emphasized, however, that the bikers may be indicted if proven that they committed rape or torture.   

Several European nations including the United Kingdom have started cracking down on people suspected of supporting or joining terrorist groups in the Middle East.

Authorities have seized passports in a bid to prevent nationals from participating in the jihad waged by the Islamic State terrorists, who have been wreaking havoc in the Middle East. Citizens returning from terrorism hotspots have also been warned of getting prosecuted for their war crimes, AFP reported.

The No Surrender bikers' Mideast journey reportedly follows that of several American militants who are believed to have gone to war with ISIS in the Syrian town of Kobani, said a report by The New York Times.

TagsDutch No Surrender biker gang, motorcycle gang, netherlands, Islamic State in Iraq, No Surrender bikers, ISIL