Cologne police chief Wolfgang Albers says witnesses described the assaults as coming from a group
of up to 1,000 men whose appearance indicated they were of "Arab or North African origin."
Some 60 criminal complaints have so far been filed, including one allegation of rape.
http://www.nytimes.com/aponline/2016/01/04/world/europe/ap-eu-germany-sex-assaults.html