Cologne was the scene of mass sexual assault on New Year’s Eve. Police say more than 500 complaints have now been filed, with about 40 percent involving sexual offenses. Read more here and check out other news about women that made it to the headlines this week.

Demonstration against sexism in Cologne January 5, 2016 © picture-alliance/dpa/O. Berg

On New Years’s Eve, hundreds of men sexually harassed women in public. How could this happen? What are the impacts of group dynamics in such a situation? Dr. Barbara Krahé, a social psychology professor, explains.