Asylum-seekers are among those suspected of involvement in violence on New Year's Eve in Cologne, officials said on Friday, intensifying debate about Germany's welcoming of hundreds of thousands of migrants.
Some 121 women are reported to have been robbed, threatened or sexually molested by gangs of men as revelers partied near the city's twin-spired Gothic Cathedral.
The assaults have shaken Germans and prompted ruling parties to promise to crack down on migrants who commit crimes.
Cologne police said they had arrested two males aged 16 and 23 with "North African roots" suspected of involvement in the assaults. A spokeswoman gave no further details.