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A 26-year-old Algerian asylum seeker has become the first suspect to be arrested over alleged sexual offences in Cologne on New Year's Eve.
The man, who has not been named, was detained at a refugee shelter in the town of Kerpen over the weekend, prosecutors say.
He was being held on suspicion of groping a woman and stealing her phone.
Cologne police are now investigating 21 people over the attacks - almost all for non-sexual offences.
Eight are in detention awaiting trial, public prosecutor Ulrich Bremer said. Most are accused of theft.
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Police say 883 people have now filed criminal complaints over the events in Cologne, including 497 women alleging sexual assault.
The number of alleged crimes stands at 766, including three rapes.
The 26-year-old Algerian was arrested in Kerpen, about 30km (19 miles) south-west of Cologne, along with another 22-year-old Algerian who allegedly stole a mobile phone.
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