Cologne's new police chief Jürgen Mathies said on Thursday that there is no evidence the sexual assaults in the city on the Rhine were organized – but admits it will be tough to bring the perpetrators to justice.

"There is no evidence that we are dealing with structures of organized crime here," Mathies said.

"We believe this was transmitted through social networks. A few people did in fact say, 'hey, we're going to Cologne, there's going to be a big party."

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