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Members of the far right NDP group planned to take to Cologne's main square, the scene of the depraved New Year sex attacks, to voice their oposition to Angela Merkel's controversial open door migration policy – but police banned the event amid safety concerns. Undeterred, dozens of protesters scaled Cologne's train station, unveiling nationalist banners and chanting anti-mass immigration slogans. In a well-orchestrated and pre-planned move, the NDP supporters clamberd onto the station's roof and revealed their anti-migrant banner.

Police earlier cancelled the event, citing "a serious security threat, which cannot be averted otherwise". The original protest was supposed to take place in the square itself, facing the cathedral that was the backdrop to the sickenig volume of sexual assaults committed against hundreds of women.

GOOGLEMAPS This is the scene of Cologne's train station where far right activists campaign against migrants

GETTY Violent protests have erupted in response to the depraved migrant sex attacks in Cologne

According to Germany's Die Welt news outlet, 267 investigations against 333 suspects were launched in the wake of New Year's Eve's carnage. However, half of the proceedings have been dropped by prosecutors and only 30 people have been convicted.

Cologne: Sex Attacks and Robberies Tue, January 12, 2016 Thirty-one suspects, including 18 asylum seekers, are under investigation over offences including sexual assault and theft in Cologne on New Year's Eve. Far right protestors in Lepzig have rallied against refugees and German chancellor Angela Merkel. Play slideshow Reuters•Getty 1 of 22 Protestors in Lepzig rally after over 100 women were sexually assualted on New Year's Eve