Cases of sexual assault on New Year's Eve have been reported in several German cities, including Berlin, Cologne, Hamburg, Stuttgart, Dusseldorf and Frankfurt.

Cologne, which was the first city to report such incidents, has registered 90 cases. Women have said they were molested, groped and robbed. One case of rape is also being investigated.

Three suspects in Cologne have been identified, though no arrests have followed.

At least 53 cases of harassment, of which 39 are of sexual harassment, have been reported from Hamburg.

Capital Berlin is the latest to join the list of cities that experienced shocking incidents of sexual assault by men who are being said to be of Arab or north African descent.

Morgenpost reported that three women were assaulted in front of the Brandenburg Gate on New Year's Eve. Two people â€” an Iraqi and a Pakistani â€” have been arrested. They are said to be from a refugee camp.

In Frankfurt, seven women were reportedly assaulted by men in groups in two separate incidents.

The women said the perpetrators had north African appearance and spoke with a strong Arabic accents, reported The Local.

"We didn't know of the phenomenon, where groups of men severely sexual molest women, until now," a police spokesperson said.

Duesseldorf reported 11 and Stuttgart two incidents of sexual violence against 18-year-old women as well as other young women, reports Breitbart. In all the incidents the perpetrators have been identified as north African or Arabic.

The attacks on the New Year's Eve have led to outrage over Germany's refugee policy.

Around 400 people on 6 January launched a protest at the main train station in Cologne, where the largest number of sexual assaults have been reported, said The Telegraph.

Henriette Reker, Cologne's Mayor, who had said women should keep strange men at an arm's length, has been criticised sharply for her remarks.

"There's always the possibility of keeping a certain distance of more than an arm's length â€” that is to say to make sure yourself you don't look to be too close to people who are not known to you, and to whom you don't have a trusting relationship," said Reker.

The police have described the assaults in Cologne as "a new dimension in crime".

The interior minister of the state of North Rhine-Westphalia, Ralf Jaeger, has criticised the police force for their inefficient police work and sought a detailed report on the mass attacks.

Reker said there is no reason to believe the assaulters were refuge-seekers, while other leaders have said that the whole community of refugees should not be viewed with suspicion.