The mayor of Cologne has summoned police for crisis talks after about 80 women reported sexual assaults and muggings by men on New Year's Eve.
The scale of the attacks on women at the city's central railway station has shocked Germany. About 1,000 drunk and aggressive young men were involved.
City police chief Wolfgang Albers called it "a completely new dimension of crime". The men were of Arab or North African appearance, he said.
Women were also targeted in Hamburg.
But the Cologne assaults - near the city's iconic cathedral - were the most serious, German media report. At least one woman was raped, and many were groped.
Most of the crimes reported to police were robberies. A volunteer policewoman was among those sexually molested. Many women will not tell if they were raped or sexually assaulted in other ways serious. It is very traumatic. I went through a similar case in Lagos at 13yo and for that reason I never visit Lagos but once a year, have no business connections or affiliation with that city.
READ my personal story here.
With Files from BBC