Police confront supporters of the anti-immigration right-wing movement PEGIDA (or Patriotic Europeans Against the Islamisation of the West) during a march in Cologne, Germany, on Jan. 9.

German riot police broke up far-right protesters in Cologne on Saturday as they marched against Germany's open-door migration policy after dozens of asylum seekers were arrested for mass assaults on women on New Year's Eve. The attacks, ranging from sexual molestation to theft, shocked Germany, which took in 1.1 million migrants and refugees in 2015 under asylum laws championed by Chancellor Angela Merkel, despite fervent opposition.